Clean up redirect files

Add expiry dates to redirects that were missing
them, and delete redirects more than a year old.

doc/.vale/gitlab/Acronyms.yml

@@ -149,6 +149,7 @@ exceptions:
   - TODO
   - TOML
   - TTL
+  - UDP
   - UNIX
   - URI
   - URL

doc/administration/external_database.md

----
-redirect_to: 'postgresql/external.md'
----
-
-# Configure GitLab using an external PostgreSQL service
-
-This content has been moved to a [new location](postgresql/external.md).

doc/development/documentation/styleguide.md

@@ -3,3 +3,6 @@ redirect_to: 'styleguide/index.md'
 ---
 This document was moved to [another location](styleguide/index.md).
+
+<!-- This redirect file can be deleted after <2022-02-13>. -->
+<!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/#move-or-rename-a-page -->

doc/development/fe_guide/components.md

----
-redirect_to: 'https://design.gitlab.com/components/status/'
----

doc/development/fe_guide/dropdowns.md

----
-redirect_to: 'https://design.gitlab.com/components/dropdown/'
----

doc/development/product_analytics/index.md

@@ -4,10 +4,5 @@ redirect_to: 'https://about.gitlab.com/handbook/product/product-intelligence-gui
 This document was moved to [another location](https://about.gitlab.com/handbook/product/product-intelligence-guide/).
-<!-- Needed by the Product Intelligence group
-
-Since our new standard for redirects otherwise lies within the gitlab-docs repo,
-as long as we need a redirect to the handbook, we need to retain this file.
- -->
 <!-- This redirect file can be deleted after December 1, 2021. -->
 <!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/#move-or-rename-a-page -->

doc/development/ui_guide.md

----
-redirect_to: 'https://design.gitlab.com/'
----
-
-The content of this document was moved into the [GitLab Design System](https://design.gitlab.com/).

doc/development/ux_guide/animation.md

----
-redirect_to: 'https://design.gitlab.com/product-foundations/motion/'
----
-
-The content of this document was moved into the [GitLab Design System](https://design.gitlab.com/product-foundations/motion/).

doc/development/ux_guide/basics.md

----
-redirect_to: 'https://design.gitlab.com/'
----
-
-The content of this document was moved into the [GitLab Design System](https://design.gitlab.com/).

doc/development/ux_guide/components.md

----
-redirect_to: 'https://design.gitlab.com/'
----
-
-The content of this document was moved into the [GitLab Design System](https://design.gitlab.com/).

doc/development/ux_guide/copy.md

----
-redirect_to: 'https://design.gitlab.com/'
----
-
-The content of this document was moved into the [GitLab Design System](https://design.gitlab.com/).

doc/development/ux_guide/features.md

----
-redirect_to: 'https://design.gitlab.com/'
----
-
-The content of this document was moved into the [GitLab Design System](https://design.gitlab.com/).

doc/development/ux_guide/illustrations.md

----
-redirect_to: 'https://design.gitlab.com/product-foundations/illustration/'
----
-
-The content of this document was moved into the [GitLab Design System](https://design.gitlab.com/product-foundations/illustration/).

doc/development/ux_guide/index.md

----
-redirect_to: 'https://design.gitlab.com/'
----
-
-The content of this document was moved into the [GitLab Design System](https://design.gitlab.com/).

doc/development/ux_guide/principles.md

----
-redirect_to: 'https://design.gitlab.com/'
----
-
-The content of this document was moved into the [GitLab Design System](https://design.gitlab.com/).

doc/development/ux_guide/resources.md

----
-redirect_to: 'https://design.gitlab.com/resources/design-resources/'
----
-
-The content of this document was moved into the [GitLab Design System](https://design.gitlab.com/resources/design-resources/).

doc/development/ux_guide/surfaces.md

----
-redirect_to: 'https://design.gitlab.com/'
----
-
-The content of this document was moved into the [GitLab Design System](https://design.gitlab.com/).

doc/development/ux_guide/tips.md

----
-redirect_to: 'https://design.gitlab.com/'
----
-
-The content of this document was moved into the [GitLab Design System](https://design.gitlab.com/).

doc/development/writing_documentation.md

----
-redirect_to: 'documentation/index.md'
----

doc/install/structure.md

----
-redirect_to: installation.md#gitlab-directory-structure
----
-
-This page was moved to [another location](installation.md#gitlab-directory-structure).