Reason:
Some code in 2015.
Not listed on Wikiapiary or mediawiki.org
Brings in semantic mediawiki as a composer package which CI does not support
- Archive documentation on mediawiki.org no such page
- Remove from mediawiki/extensions ( along with in .gitmodules)
- Remove tests in integration/config ( zuul/layout.yaml )
- Remove from translatewiki ( groups/MediaWiki/mediawiki-extensions.txt)
- Remove manifest/other references from mediawiki/vagrant if they exist
- Empty repository and add a OBSOLETE file.
- Archive the extension's diffusion repository: rESLN
- Mark the repository read-only in Gerrit: https://gerrit.wikimedia.org/r/#/admin/projects/mediawiki/extensions/SemanticLinks
- Delete the GitHub mirror: https://github.com/wikimedia/mediawiki-extensions-SemanticLinks