**Reason**
[your rationale]
**To-do list**
- This task
-- [ ] Add maintainers of that extension/skin as subscribers to this task (if they have no apparent Phabricator account, notify them on-wiki or via email if possible and note it here).
-- [x] Add Phabricator project <#ProjectX> as a tag for this task, or #mediawiki-extensions-other/#other-skins if there is no project.
- On-wiki documentation
-- [x] Archive documentation on `mediawiki.org` (provide URL): replace page contents with `{{TNT|Archived extension|last revision id before archiving|reason=archive reasons, per [[phab:T207137]]}}` (for extensions)/`{{TNT|Archived skin|last revision|reason=archive reasons, per [[phab:T207137]]}}` (for skins); include a link to this task in the `reason` parameter.
-- [x] If documentation page was translatable, remove `<translate>`, visit Special:PageTranslation, and click "remove from translation" (if you don't have the translation administrator right, ask a [[ https://www.mediawiki.org/wiki/Special:ListUsers/translationadmin | user who does ]]).
-- [x] Archive Wikidata item associated with documentation page (https://www.wikidata.org/wiki/Q21677568) (remove nearly all statements, except `instance of (P31) = MediaWiki extension (Q6805426)/MediaWiki skin (Q21996535)`, which should add a qualifier `end time (P582) = the YYYY-MM-DD date that you decided to archive extension/skin, generally per edit history`, change English (and other languages if possible) description to "archived MediaWiki extension"/"archived MediaWiki skin" (and its translation)).
- Phabricator
-- [ ] Archive Phabricator project <#ProjectX> for the extension/skin.
-- [ ] Mark all Phabricator tasks for the extension/skin either Declined or Invalid.
-- [ ] Edit Phabricator project <#ProjectX> description for the extension/skin with a link to this ticket.
- Translatewiki.net/translations
-- [ ] Remove from `translatewiki.net` (`groups/MediaWiki/mediawiki-extensions.txt` / `groups/MediaWiki/mediawiki-skins.txt`) (add #translatewiki.net project as a tag for this task).
- Configuration/tests/integrations/etc.
-- [ ] Remove from `mediawiki/extensions` / `mediawiki/skins` (along with in `.gitmodules`).
-- [ ] Remove tests in [[ https://gerrit.wikimedia.org/g/integration/config | `integration/config` ]] (`zuul/layout.yaml`).
-- [ ] Remove manifest/other references from `mediawiki/vagrant` if they exist.
-- [ ] Remove from https://doc.wikimedia.org/cover-extensions/ if present (requires #continuous-integration-infrastructure shell user to delete directly from the server).
- Repositories
-- [ ] Empty repository and add an ARCHIVED file.
-- [ ] Archive the diffusion repository for the extension/skin: (provide the Diffusion repository callsign or URL).
-- [ ] Mark the repository read-only in Gerrit: (provide Gerrit Repository URL).
-- [ ] Delete the GitHub mirror: (provide GitHub repository URL).