**Reason**
{T358813} announced that this was done, but it wasn't.
[ ] Project
[x] Add maintainers to this task
[ ] Documentation anywhere?
[ ] Releases
[ ] Mark as archived in NPM: https://www.npmjs.com/package/oojs-router
[ ] CI
[x] Un-spec from CI config
[ ] Delete coverage: https://doc.wikimedia.org/cover/oojs-router/
[ ] Delete documentation: https://doc.wikimedia.org/oojs-router/master/
[ ] Repo
[x] Empty repo in gerrit: https://gerrit.wikimedia.org/r/c/oojs/router/+/1135995
[ ] Mark the repository read-only in Gerrit (also edit description to prepend "[ARCHIVED]" and a reference to this task, remove all access lists and reparent on `All-Archived-Projects`): (provide Gerrit Repository URL).
[ ] Deactivate the Diffusion repository: https://phabricator.wikimedia.org/source/oojs-router/
[ ] Delete the GitHub mirror: https://github.com/wikimedia/oojs-router