Anonymous editing in MobileFrontend has been enabled on Wikimedia wikis since 2015 ({T93210}) and enabled by default in the extension shortly thereafter ({1d327aca4eabd5beebc80a7387492810035fb651}).
There is still an option to disable it: `$wgMFEditorOptions['anonymousEditing'] = false;`, and a lot of code (in Minerva) to support this, including a popup (call-to-action) in the mobile editor urging users to register (in 'skins.minerva.editor' module), and a popup (guider) on the page urging them to to edit after they have registered via the previous popup (in 'skins.minerva.newusers' module). All of this never runs and is never tested.
I think we should remove this option and the code supporting it.
= acceptance criteria
[] Make sure code relating to anonymous CTAs for section edit links is removed.
[] ~~Editing button respects wgPermissions~~ see T206823
= QA steps
Test on the beta cluster https://en.wikipedia.beta.wmflabs.org/wiki/Transcluded_page
Some exploratory testing would be useful here.
* As an anonymous user can you edit the page?
* Do the options to login/sign in work?