Reason:
DidYouMean has been proposed more than ten years ago (T10648) but never moved forward.
- Archive documentation on mediawiki.org ( https://www.mediawiki.org/wiki/Extension:DidYouMean )
- Remove from mediawiki/extensions ( 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 MediaWiki-extensions-DidYouMean for associated extension
- Edit Phabricator project MediaWiki-extensions-DidYouMean description for associated extension with a link to this ticket
- Archive the extension's diffusion repository: ( https://phabricator.wikimedia.org/diffusion/EDYM/ )
- Mark the repository read-only in Gerrit: ( https://gerrit.wikimedia.org/r/#/admin/projects/mediawiki/extensions/DidYouMean )
- Delete the GitHub mirror: https://github.com/wikimedia/mediawiki-extensions-DidYouMean