**Reason**
@Nikerabbit in T216480#4974929 :
> Translatewiki.net doesn't use the extension anymore. I don't think anybody else uses it either. Wikiapiary is down so cannot check there. I would recommend archiving the extension.
@Nikerabbit in https://gerrit.wikimedia.org/r/#/c/492460/
> I wrote this in the task earlier but looks like nobody noticed: "To my knowledge nobody is using this extension. I would recommend archiving the extension."
Should be double-checked though.
**To-do list**
- This task
-- [X] Add maintainers of that extension 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 if there is no project.
- On-wiki documentation
-- [x] Archive documentation on `mediawiki.org` ( https://www.mediawiki.org/wiki/Extension:FirstSteps ): replace page contents with `{{TNT|Archived extension|last revision id before archiving|reason=archive reasons, per [[phab:T226149]]}}`; 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/Q21676755 ) (remove nearly all statements, except `instance of (P31) = MediaWiki extension (Q6805426)`, which should add a qualifier `end time (P582) = the YYYY-MM-DD date that you decided to archive extension, generally per edit history`, change English (and other languages if possible) description to "archived MediaWiki extension" (and its translation)).
- Phabricator (dedicated project does not exist; no [open dedicated tasks](https://phabricator.wikimedia.org/maniphest/query/d7LpLVHMABPB/#R) to decline)
- Translatewiki.net/translations
-- [x] Remove from `translatewiki.net` (`groups/MediaWiki/mediawiki-extensions.txt`) (add #translatewiki.net project as a tag for this task).
- Configuration/tests/integrations/etc.
-- [x] Remove from `mediawiki/extensions` (along with in `.gitmodules`).
-- [x] Remove tests in [[ https://gerrit.wikimedia.org/g/integration/config | `integration/config` ]] (`zuul/layout.yaml`).
- Repositories
-- [ ] Empty repository leaving only the README indicating the repo is archived and referring to this task by URL.
-- [ ] Mark the repository read-only in Gerrit (Edit description to prepend "[ARCHIVED]" and append Task reference): (https://gerrit.wikimedia.org/r/admin/projects/mediawiki/extensions/FirstSteps).
-- [ ] Archive the diffusion repository for the extension: ( rEFIR ).
-- [ ] Delete the GitHub mirror: (https://github.com/wikimedia/mediawiki-extensions-FirstSteps).