**Reason**
No longer used extension. I have [[ https://www.mediawiki.org/w/index.php?title=Extension%3AWikidata_build&type=revision&diff=2832450&oldid=2810414 | archived the page from MediaWiki.org ]].
**To-Do list**
- [x] 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`).
- [ ] Remove manifest/other references from `mediawiki/vagrant` if they exist.
- [ ] Empty repository and add an ARCHIVED 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 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).