Conflicts:
- `app/models/concerns/user/has_settings.rb`:
Not a real conflict, upstream added a setting textually close to a glitch-soc one.
Added upstream's new setting.
- `app/views/settings/preferences/appearance/show.html.haml`:
Not a real conflict, upstream added a setting textually close to a glitch-soc one.
Added upstream's new setting.
- `config/routes.rb`:
Upstream moved web app routes to `config/routes/web_app.rb`, while glitch-soc had
an extra route.
Moved the extra route to `config/routes/web_app.rb`.
- `spec/controllers/settings/preferences/appearance_controller_spec.rb`:
This spec got converted to a system spec upstream.
However, the theme setting works differently in glitch-soc, so the spec had been
changed.
Changed the corresponding system spec as well.
