Deploy the settings feature branch everywhere
= Pre-checklist
[x] Ensure https://gerrit.wikimedia.org/r/403841 got merged (otherwise stable features will be listed in beta)
[x] Check QA has occurred on staging
@phuedx: {T184742} is a direct subtask (blocker).
= Acceptance criteria
[x] Merge `specialpages` branch in Minerva to master.
[x] Merge `specialpages` branch in MobileFrontend to master.
[x] Un-deploying is simple (revert a single commit instead of multiple).
[x] Merge as early in the week as possible so translators can make updates before it goes to prod (This should ideally be merged on the 5th)
[x] Link feedback page to https://www.mediawiki.org/wiki/Reading/Web/Settings
= Testing criteria
[] This will deploy the new settings page to the beta cluster which will roll out to production on the next train. Testing should occur on https://en.m.wikipedia.beta.wmflabs.org/w/index.php?title=Special:MobileOptions&returnto=Special%3AMobileOptions
[] Feedback page should show on Special:MobileOptions
= Post deploy/sign off
[x] Update https://www.mediawiki.org/wiki/Reading/Web/Release_timeline (make sure to include the patch merge date and deploy date)
[] Update on mailing lists
[x] Update [the MobileFrontend documentation](https://www.mediawiki.org/wiki/Extension:MobileFrontend) to reflect that it requires the latest version of MediaWiki (dependencies have been reflected by a version bump in Minerva+MobileFrontend)