**Reason**:
- [ ] Archive documentation on `mediawiki.org` ( provide the URL to the extension/skin here )
- [ ] Remove from `mediawiki/extensions` / `mediawiki/skins` ( along with in `.gitmodules`)
- [ ] Remove tests in `integration/config` ( `zuul/layout.yaml` )
- [ ] Remove from `translatewiki` ( `groups/MediaWiki/mediawiki-extensions.txt` / `groups/MediaWiki/mediawiki-skins.txt` )
- [ ] Empty repository and add a OBSOLETE file.
- [ ] Archive Phabricator project <#ProjectX> for associated extension/skin
- [ ] Edit Phabricator project <#ProjectX> description for associated extension/skin with a link to this ticket
- [ ] Archive the extension's diffusion repository: (Provide Diffusion Repository URL)
- [ ] Mark the repository read-only in Gerrit: (Provide Gerrit Repository URL)