Reason: BookManagerv2 has been archived recently, and BookManager has a big warning at the top of https://www.mediawiki.org/wiki/Extension:BookManager saying that this is no longer mantained and that we look for the (now also archived v2 version). As such, we should archive this one too.
- Archive documentation on mediawiki.org https://www.mediawiki.org/wiki/Extension:BookManager
- Remove from mediawiki/extensions (along with in .gitmodules)
- Remove tests in integration/config (zuul/layout.yaml)
- Remove from translatewiki (groups/MediaWiki/mediawiki-extensions.txt)
- Empty repository and add a ARCHIVED file.
- Archive Phabricator project MediaWiki-extensions-BookManager
- Edit Phabricator project MediaWiki-extensions-BookManager description for associated extension/skin with a link to this ticket
- Archive the extension's diffusion repository rEBMA
- Mark the repository read-only in Gerrit
- Delete the GitHub mirror: https://github.com/wikimedia/mediawiki-extensions-BookManager