Reason: T195531
- Archive documentation on MediaWiki.org
- Remove submodule from mediawiki/extensions
- Remove tests in integration/config: zuul/layout.yaml
- Remove from translatewiki: groups/MediaWiki/mediawiki-extensions.txt: https://gerrit.wikimedia.org/r/#/c/435126/
- Remove manifest/other references from mediawiki/vagrant if they exist (not relevant here)
- Empty repository and add a OBSOLETE file.
- Archive Phabricator project NewUsersList
- Edit Phabricator project NewUsersList description with a link to this ticket
- Archive the extension's diffusion repository: https://phabricator.wikimedia.org/diffusion/ENUL/
- Mark the repository read-only in Gerrit: https://gerrit.wikimedia.org/r/#/admin/projects/mediawiki/extensions/NewUsersList
- Delete the GitHub mirror: https://github.com/wikimedia/mediawiki-extensions-NewUsersList