Merge branch 'docs-redirects4' into 'master'

Docs: Add automatic redirects to last batch of moved files

See merge request gitlab-org/gitlab-ce!25904

doc/api/build_triggers.md

-This document was moved to [Pipeline Triggers](pipeline_triggers.md).
+---
+redirect_to: 'pipeline_triggers.md'
+---
+
+This document was moved to [another location](pipeline_triggers.md).

doc/api/builds.md

+---
+redirect_to: 'jobs.md'
+---
+
 This document was moved to [another location](jobs.md).

doc/customization/welcome_message.md

+---
+redirect_to: 'branded_login_page.md'
+---
+
 This document was moved to [another location](branded_login_page.md).

doc/development/fe_guide/testing.md

-This document was moved to [../testing_guide/frontend_testing.md](../testing_guide/frontend_testing.md).
+---
+redirect_to: '../testing_guide/frontend_testing.md'
+---
+
+This document was moved to [another location](../testing_guide/frontend_testing.md).

doc/development/i18n_guide.md

-This document was moved to [a new location](i18n/index.md).
+---
+redirect_to: 'i18n/index.md'
+---
+
+This document was moved to [another location](i18n/index.md).

doc/development/testing.md

-This document was moved to [testing_guide/index.md](testing_guide/index.md).
+---
+redirect_to: 'testing_guide/index.md'
+---
+
+This document was moved to [another location](testing_guide/index.md).

doc/markdown/markdown.md

-This document was moved to [user/markdown.md](../user/markdown.md).
+---
+redirect_to: '../user/markdown.md'
+---
+
+This document was moved to [another location](../user/markdown.md).

doc/operations/README.md

+---
+redirect_to: '../administration/operations/index.md'
+---
+
 This document was moved to [another location](../administration/operations/index.md).

doc/operations/cleaning_up_redis_sessions.md

-This document was moved to [administration/operations/cleaning_up_redis_sessions](../administration/operations/cleaning_up_redis_sessions.md).
+---
+redirect_to: '../administration/operations/cleaning_up_redis_sessions.md'
+---
+
+This document was moved to [another location](../administration/operations/cleaning_up_redis_sessions.md).

doc/operations/moving_repositories.md

-This document was moved to [administration/operations/moving_repositories](../administration/operations/moving_repositories.md).
+---
+redirect_to: '../administration/operations/moving_repositories.md'
+---
+
+This document was moved to [another location](../administration/operations/moving_repositories.md).

doc/operations/sidekiq_memory_killer.md

-This document was moved to [administration/operations/sidekiq_memory_killer](../administration/operations/sidekiq_memory_killer.md).
+---
+redirect_to: '../administration/operations/sidekiq_memory_killer.md'
+---
+
+This document was moved to [another location](../administration/operations/sidekiq_memory_killer.md).

doc/operations/unicorn.md

-This document was moved to [administration/operations/unicorn](../administration/operations/unicorn.md).
+---
+redirect_to: '../administration/operations/unicorn.md'
+---
+
+This document was moved to [another location](../administration/operations/unicorn.md).

doc/pages/README.md

-This document was moved to [pages/index.md](../user/project/pages/index.md).
+---
+redirect_to: '../user/project/pages/index.md'
+---
+
+This document was moved to [another location](../user/project/pages/index.md).

doc/pages/administration.md

-This document was moved to [administration/pages](../administration/pages/index.md).
+---
+redirect_to: '../administration/pages/index.md'
+---
+
+This document was moved to [another location](../administration/pages/index.md).

doc/pages/getting_started_part_one.md

+---
+redirect_to: '../user/project/pages/getting_started_part_one.md'
+---
+
 This document was moved to [another location](../user/project/pages/getting_started_part_one.md).

doc/pages/getting_started_part_three.md

+---
+redirect_to: '../user/project/pages/getting_started_part_three.md'
+---
+
 This document was moved to [another location](../user/project/pages/getting_started_part_three.md).

doc/pages/getting_started_part_two.md

+---
+redirect_to: '../user/project/pages/getting_started_part_two.md'
+---
+
 This document was moved to [another location](../user/project/pages/getting_started_part_two.md).

doc/raketasks/check.md

-# Check Rake Tasks
+---
+redirect_to: '../administration/raketasks/check.md'
+---
 
-This document was moved to [administration/raketasks/check](../administration/raketasks/check.md).
+This document was moved to [another location](../administration/raketasks/check.md).

doc/raketasks/maintenance.md

-# Maintenance Rake Tasks
+---
+redirect_to: '../administration/raketasks/maintenance.md'
+---
 
-This document was moved to [administration/raketasks/maintenance](../administration/raketasks/maintenance.md).
+This document was moved to [another location](../administration/raketasks/maintenance.md).