Add remove_date to YAML front matter of redirect docs

doc/administration/auth/okta.md

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 redirect_to: '../../integration/saml.md'
+remove_date: '2021-06-15'
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doc/administration/geo/replication/remove_geo_node.md

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 redirect_to: '../../geo/replication/remove_geo_site.md'
+remove_date: '2021-06-01'
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doc/administration/geo/replication/using_a_geo_server.md

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 redirect_to: '../../geo/replication/usage.md'
+remove_date: '2022-06-01'
 ---
 
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doc/administration/git_annex.md

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 redirect_to: 'index.md'
+remove_date: '2021-07-22'
 ---
 
 This document was moved to [another location](index.md).

doc/api/dora4_group_analytics.md

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 redirect_to: 'dora/metrics.md'
+remove_date: '2021-07-25'
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doc/ci/chatops/README.md

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+remove_date: '2021-05-01'
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doc/ci/docker/README.md

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+remove_date: '2021-05-01'
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doc/ci/examples/test-and-deploy-python-application-to-heroku.md

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 redirect_to: 'README.md#contributed-examples'
+remove_date: '2021-06-01'
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 This document was moved to [another location](README.md#contributed-examples).

doc/ci/examples/test-and-deploy-ruby-application-to-heroku.md

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 redirect_to: 'README.md#contributed-examples'
+remove_date: '2021-06-01'
 ---
 
 This document was moved to [another location](README.md#contributed-examples).

doc/ci/examples/test-clojure-application.md

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 redirect_to: 'README.md#contributed-examples'
+remove_date: '2021-05-26'
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 This document was moved to [another location](README.md#contributed-examples).

doc/ci/quick_start/README.md

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+remove_date: '2021-05-01'
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doc/ci/services/README.md

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+remove_date: '2021-05-01'
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doc/ci/ssh_keys/README.md

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doc/development/documentation/site_architecture/release_process.md

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 redirect_to: 'https://about.gitlab.com/handbook/engineering/ux/technical-writing/workflow/#monthly-documentation-releases'
+remove_date: '2021-07-12'
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 This file was moved to [another location](https://about.gitlab.com/handbook/engineering/ux/technical-writing/workflow/#monthly-documentation-releases).

doc/development/event_tracking/backend.md

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 redirect_to: 'https://about.gitlab.com/handbook/product/product-intelligence-guide/'
+remove_date: '2021-12-01'
 ---
 
 This document was moved to [another location](https://about.gitlab.com/handbook/product/product-intelligence-guide/).
 
-<!-- This redirect file can be deleted after December 1, 2021. -->
+<!-- This redirect file can be deleted after 2021-12-01. -->
 <!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/#move-or-rename-a-page -->

doc/development/event_tracking/frontend.md

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 redirect_to: 'https://about.gitlab.com/handbook/product/product-intelligence-guide/'
+remove_date: '2021-12-01'
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 This document was moved to [another location](https://about.gitlab.com/handbook/product/product-intelligence-guide/).
 
-<!-- This redirect file can be deleted after December 1, 2021. -->
+<!-- This redirect file can be deleted after 2021-12-01. -->
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doc/development/event_tracking/index.md

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 redirect_to: 'https://about.gitlab.com/handbook/product/product-intelligence-guide/'
+remove_date: '2021-12-01'
 ---
 
 This document was moved to [another location](https://about.gitlab.com/handbook/product/product-intelligence-guide/).
 
-<!-- This redirect file can be deleted after December 1, 2021. -->
+<!-- This redirect file can be deleted after 2021-12-01. -->
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doc/development/fe_guide/event_tracking.md

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 redirect_to: 'https://about.gitlab.com/handbook/product/product-intelligence-guide/'
+remove_date: '2021-12-01'
 ---
 
 This document was moved to [another location](https://about.gitlab.com/handbook/product/product-intelligence-guide/).
 
-<!-- This redirect file can be deleted after December 1, 2021. -->
+<!-- This redirect file can be deleted after 2021-12-01. -->
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doc/development/feature_flags/development.md

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+remove_date: '2021-06-01'
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 This document was moved to [another location](index.md).
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doc/development/feature_flags/process.md

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 redirect_to: 'https://about.gitlab.com/handbook/product-development-flow/feature-flag-lifecycle/'
+remove_date: '2021-06-01'
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doc/development/new_fe_guide/dependencies.md

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 redirect_to: '../fe_guide/dependencies.md'
+remove_date: '2021-05-14'
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doc/development/product_analytics/event_dictionary.md

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 redirect_to: 'https://about.gitlab.com/handbook/product/product-intelligence-guide/'
+remove_date: '2021-12-01'
 ---
 
 This document was moved to [another location](https://about.gitlab.com/handbook/product/product-intelligence-guide/).
 
-<!-- This redirect file can be deleted after December 1, 2021. -->
+<!-- This redirect file can be deleted after 2021-12-01. -->
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doc/development/product_analytics/index.md

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 redirect_to: 'https://about.gitlab.com/handbook/product/product-intelligence-guide/'
+remove_date: '2021-12-01'
 ---
 
 This document was moved to [another location](https://about.gitlab.com/handbook/product/product-intelligence-guide/).
 
-<!-- This redirect file can be deleted after December 1, 2021. -->
+<!-- This redirect file can be deleted after 2021-12-01. -->
 <!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/#move-or-rename-a-page -->

doc/development/snowplow.md

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 redirect_to: 'snowplow/index.md'
+remove_date: '2021-06-31'
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+
 <!-- This redirect file can be deleted after 2021-06-31. -->
 <!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/#move-or-rename-a-page -->

doc/development/usage_ping.md

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 redirect_to: 'usage_ping/index.md'
+remove_date: '2021-05-23'
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 This document was moved to [another location](usage_ping/index.md).
+
 <!-- This redirect file can be deleted after <2021-05-23>. -->
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\ No newline at end of file

doc/development/what_requires_downtime.md

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 redirect_to: 'avoiding_downtime_in_migrations.md'
+remove_date: '2021-07-01'
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 This document was moved to [another location](avoiding_downtime_in_migrations.md).

doc/downgrade_ee_to_ce/README.md

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+remove_date: '2021-05-11'
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 This document was moved to [another location](index.md).

doc/gitlab-basics/README.md

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+remove_date: '2021-05-11'
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 This document was moved to [another location](index.md).

doc/gitlab-basics/create-project.md

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 redirect_to: '../user/project/working_with_projects.md'
+remove_date: '2021-05-05'
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 This document was moved to [another location](../user/project/working_with_projects.md).

doc/gitlab-basics/create-your-ssh-keys.md

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 redirect_to: '../ssh/README.md'
+remove_date: '2021-07-04'
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 This document was moved to [another location](../ssh/README.md).

doc/gitlab-basics/fork-project.md

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+remove_date: '2021-05-04'
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 This document was moved to [another location](../user/project/working_with_projects.md).

doc/install/README.md

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+remove_date: '2021-05-11'
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 This document was moved to [another location](index.md).

doc/integration/README.md

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+remove_date: '2021-07-30'
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 This document was moved to [another location](index.md).

doc/integration/google_workspace_saml.md

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+remove_date: '2021-06-15'
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 This document was moved to [another location](saml.md).

doc/integration/jira_development_panel.md

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+remove_date: '2021-06-24'
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doc/intro/README.md

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+remove_date: '2021-05-11'
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doc/legal/README.md

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doc/operations/incident_management/alert_integrations.md

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+remove_date: '2021-05-03'
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doc/raketasks/README.md

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doc/security/cicd_environment_variables.md

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+remove_date: '2021-05-15'
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doc/topics/git/lfs/migrate_from_git_annex_to_git_lfs.md

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+remove_date: '2021-07-22'
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doc/topics/git/merge_requests.md

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 redirect_to: '../../user/project/merge_requests/index.md'
+remove_date: '2021-08-13'
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doc/university/README.md

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doc/university/index.md

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+remove_date: '2021-08-13'
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 This document was removed. See our [topics](../topics/index.md) for similar content.

doc/university/training/gitlab_flow.md

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 redirect_to: '../../topics/gitlab_flow.md'
+remove_date: '2021-05-16'
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doc/university/training/index.md

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+remove_date: '2021-08-13'
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doc/university/training/topics/agile_git.md

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 redirect_to: '../../../user/project/issue_board.md'
+remove_date: '2021-07-23'
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 Information about using Agile concepts in GitLab can be found in [another location](../../../user/project/issue_board.md).

doc/university/training/topics/bisect.md

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 redirect_to: '../../../topics/git/bisect.md'
+remove_date: '2021-08-13'
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doc/university/training/topics/cherry_picking.md

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 redirect_to: '../../../topics/git/cherry_picking.md'
+remove_date: '2021-06-01'
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doc/university/training/topics/env_setup.md

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 redirect_to: '../../../topics/index.md'
+remove_date: '2021-08-13'
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 This document was removed. See our [topics](../../../topics/index.md) for similar content.

doc/university/training/topics/feature_branching.md

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 redirect_to: '../../../topics/git/feature_branching.md'
+remove_date: '2021-08-13'
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doc/university/training/topics/getting_started.md

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 redirect_to: '../../../topics/git/getting_started.md'
+remove_date: '2021-08-13'
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doc/university/training/topics/git_add.md

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+remove_date: '2021-08-13'
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doc/university/training/topics/git_intro.md

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 redirect_to: '../../../topics/index.md'
+remove_date: '2021-08-13'
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doc/university/training/topics/git_log.md

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 redirect_to: '../../../topics/git/git_log.md'
+remove_date: '2021-08-13'
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doc/university/training/topics/merge_conflicts.md

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+remove_date: '2021-08-13'
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doc/university/training/topics/merge_requests.md

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 redirect_to: '../../../user/project/merge_requests/index.md'
+remove_date: '2021-08-13'
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doc/university/training/topics/rollback_commits.md

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+remove_date: '2021-08-13'
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doc/university/training/topics/stash.md

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+remove_date: '2021-08-13'
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doc/university/training/topics/subtree.md

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+remove_date: '2021-08-13'
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doc/university/training/topics/tags.md

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+remove_date: '2021-06-01'
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doc/university/training/topics/unstage.md

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+remove_date: '2021-08-13'
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doc/university/training/user_training.md

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+remove_date: '2021-08-13'
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 This document was removed. See our [topics](../../topics/index.md) for similar content.

doc/update/README.md

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+remove_date: '2021-05-11'
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doc/user/abuse_reports.md

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doc/user/admin_area/abuse_reports.md

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+remove_date: '2021-07-21'
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doc/user/admin_area/activating_deactivating_users.md

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doc/user/admin_area/analytics/user_cohorts.md

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doc/user/admin_area/blocking_unblocking_users.md

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doc/user/clusters/agent/runner.md

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 redirect_to: 'https://docs.gitlab.com/runner/install/kubernetes-agent.html'
+remove_date: '2022-02-01'
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doc/user/group/bulk_editing/index.md

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doc/user/project/bulk_editing.md

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doc/user/project/import/gemnasium.md

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doc/user/project/integrations/hipchat.md

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+remove_date: '2021-06-30'
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 This document was moved to [another location](index.md).
+
 <!-- This redirect file can be deleted after 2021-06-30. -->
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doc/user/project/integrations/jira.md

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 redirect_to: '../../../integration/jira/index.md'
+remove_date: '2021-07-07'
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doc/user/project/integrations/jira_cloud_configuration.md

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 redirect_to: '../../../integration/jira/jira_cloud_configuration.md'
+remove_date: '2021-06-18'
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doc/user/project/integrations/jira_integrations.md

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 redirect_to: '../../../integration/jira/index.md'
+remove_date: '2021-07-13'
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doc/user/project/integrations/jira_server_configuration.md

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 redirect_to: '../../../integration/jira/jira_server_configuration.md'
+remove_date: '2021-06-18'
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doc/user/project/merge_requests/merge_request_approvals.md

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doc/user/project/merge_requests/reviewing_and_managing_merge_requests.md

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doc/user/project/merge_requests/work_in_progress_merge_requests.md

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doc/user/project/new_ci_build_permissions_model.md

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 redirect_to: '../../ci/README.md'
+remove_date: '2021-06-01'
 ---
 
 This document is deprecated. See the latest [GitLab CI/CD documentation](../../ci/README.md).