Change Details

**Reason**: Per T196429#4274031. - [x] Archive documentation on `mediawiki.org` - https://www.mediawiki.org/wiki/Extension:CustomPage ([[https://www.mediawiki.org/w/index.php?title=Extension:CustomPage&diff=prev&oldid=2804472&diffmode=source|diff]]) - [ ] Remove from `mediawiki/extensions` / `mediawiki/skins` ( along with in `.gitmodules`) - [x] Remove tests in `integration/config` ( `zuul/layout.yaml` ) - [x] Remove from `translatewiki` ( `groups/MediaWiki/mediawiki-extensions.txt` / `groups/MediaWiki/mediawiki-skins.txt` ) - [ - [x] Empty repository and add a OBSOLETE file. - [ ] Archive the extension's diffusion repository: rECSP - [ ] Mark the repository read-only in Gerrit: - [ ] Delete the GitHub mirror: