**Reason**
See T228148#5338328, but in short: Broken and unmaintained since the initial import.
**To-do list**
- This task
-- [x] Add maintainers of that extension as subscribers to this task. Left a message on the talk page, but T196790 indicates that we shouldn't need to expected a response.
-- [x] Add Phabricator project <#ProjectX> as a tag for this task, or #mediawiki-extensions-other if there is no project.
- On-wiki documentation
-- [x] Archive documentation on `mediawiki.org` (https://www.mediawiki.org/wiki/Extension:Convert2Wiki): replace page contents with `{{TNT|Archived extension|last revision id before archiving|reason=archive reasons, per [[phab:T######]]}}` include a link to this task in the `reason` parameter.
-- [x] Update Wikidata item associated with documentation page
--- [x] add statement `Abandonware (Q281039)` to `instance of (P31)` together with qualifier `start time (P580)` = the YYYY-MM-DD (date that you decided to archive extension generally per edit history)
--- [x] add qualifier `end time (P582)` = the YYYY-MM-DD (same date as above) to `instance of (P31) = MediaWiki extension (Q6805426)`
- Phabricator.
-- [ ] Mark all Phabricator tasks for the extensioneither Declined or Invalid.
- Translatewiki.net/translations
-- [x] Remove from `translatewiki.net` (`groups/MediaWiki/mediawiki-extensions.txt`)
- Configuration/tests/integrations/etc.
-- [x] Remove from `mediawiki/extensions` (along with in `.gitmodules`).
-- [ ] Remove tests in [[ https://gerrit.wikimedia.org/g/integration/config | `integration/config` ]] (`zuul/layout.yaml`).
- Repositories
-- [x] Empty repository leaving only the README indicating the repo is archived and referring to this task by URL.
-- [x] Mark the repository read-only in Gerrit (Edit description to prepend "[ARCHIVED]" and append Task reference): (https://gerrit.wikimedia.org/r/q/project:mediawiki/extensions/Convert2Wiki).
-- [x] Archive the diffusion repository for the extension: (rECTW).
-- [ ] Delete the GitHub mirror: (https://github.com/wikimedia/mediawiki-extensions-Convert2Wiki).