Remove outdated docs redirects

doc/administration/auth/okta.md

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doc/administration/geo/replication/remove_geo_node.md

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doc/ci/chatops/README.md

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doc/ci/docker/README.md

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

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

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

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doc/ci/quick_start/README.md

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doc/ci/services/README.md

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doc/ci/services/gitlab.md

@@ -37,4 +37,4 @@ For more information about why `gitlab` is used for the `Host`, see
 You can also use any other Docker image available on [Docker Hub](https://hub.docker.com/u/gitlab).
 
 The `gitlab` image can accept environment variables. For more details,
-see the [Omnibus documentation](../../install/README.md).
+see the [Omnibus documentation](../../install/index.md).

doc/ci/ssh_keys/README.md

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doc/development/documentation/index.md

@@ -556,6 +556,3 @@ padding. The padding is added around the element, enlarging the screenshot area.
 #### Live example
 
 Please use `spec/docs_screenshots/container_registry_docs.rb` as a guide and as an example to create your own scripts.
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doc/development/feature_flags/development.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'
+remove_date: '2022-03-01'
 ---
 
 This document was moved to [another location](https://about.gitlab.com/handbook/product-development-flow/feature-flag-lifecycle/).
 
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doc/development/new_fe_guide/dependencies.md

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doc/development/usage_ping.md

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doc/downgrade_ee_to_ce/README.md

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doc/gitlab-basics/README.md

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doc/gitlab-basics/create-project.md

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doc/gitlab-basics/fork-project.md

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doc/install/README.md

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doc/integration/google_workspace_saml.md

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doc/intro/README.md

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doc/legal/README.md

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doc/operations/incident_management/alert_integrations.md

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doc/raketasks/README.md

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doc/security/cicd_environment_variables.md

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doc/university/README.md

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doc/university/training/gitlab_flow.md

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doc/university/training/topics/cherry_picking.md

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doc/university/training/topics/tags.md

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doc/update/README.md

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doc/user/admin_area/analytics/user_cohorts.md

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doc/user/project/integrations/jira_cloud_configuration.md

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doc/user/project/integrations/jira_server_configuration.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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scripts/lint-doc.sh

@@ -68,8 +68,8 @@ then
 fi
 
 # Do not use 'README.md', instead use 'index.md'
-# Number of 'README.md's as of 2020-10-13
-NUMBER_READMES=28
+# Number of 'README.md's as of 2021-06-21
+NUMBER_READMES=15
 FIND_READMES=$(find doc/ -name "README.md" | wc -l)
 echo '=> Checking for new README.md files...'
 echo