Merge branch 'aqualls-add-redirects-pages' into 'master'

Create redirects for pages moved to database/

See merge request gitlab-org/gitlab!84735

doc/development/avoiding_downtime_in_migrations.md

+---
+redirect_to: 'database/avoiding_downtime_in_migrations.md'
+remove_date: '2022-07-08'
+---
+
+This document was moved to [another location](database/avoiding_downtime_in_migrations.md).
+
+<!-- This redirect file can be deleted after <2022-07-08>. -->
+<!-- Redirects that point to other docs in the same project expire in three months. -->
+<!-- Redirects that point to docs in a different project or site (for example, link is not relative and starts with `https:`) expire in one year. -->
+<!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/redirects.html -->

doc/development/background_migrations.md

+---
+redirect_to: 'database/background_migrations.md'
+remove_date: '2022-07-08'
+---
+
+This document was moved to [another location](database/background_migrations.md).
+
+<!-- This redirect file can be deleted after <2022-07-08>. -->
+<!-- Redirects that point to other docs in the same project expire in three months. -->
+<!-- Redirects that point to docs in a different project or site (for example, link is not relative and starts with `https:`) expire in one year. -->
+<!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/redirects.html -->

doc/development/deleting_migrations.md

+---
+redirect_to: 'database/deleting_migrations.md'
+remove_date: '2022-07-08'
+---
+
+This document was moved to [another location](database/deleting_migrations.md).
+
+<!-- This redirect file can be deleted after <2022-07-08>. -->
+<!-- Redirects that point to other docs in the same project expire in three months. -->
+<!-- Redirects that point to docs in a different project or site (for example, link is not relative and starts with `https:`) expire in one year. -->
+<!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/redirects.html -->

doc/development/post_deployment_migrations.md

+---
+redirect_to: 'database/post_deployment_migrations.md'
+remove_date: '2022-07-08'
+---
+
+This document was moved to [another location](database/post_deployment_migrations.md).
+
+<!-- This redirect file can be deleted after <2022-07-08>. -->
+<!-- Redirects that point to other docs in the same project expire in three months. -->
+<!-- Redirects that point to docs in a different project or site (for example, link is not relative and starts with `https:`) expire in one year. -->
+<!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/redirects.html -->