Refactor controllers for statuses, accounts, and more (#11249)

app/controllers/about_controller.rb

app/controllers/accounts_controller.rb

app/controllers/activitypub/collections_controller.rb

app/controllers/activitypub/inboxes_controller.rb

app/controllers/activitypub/outboxes_controller.rb

app/controllers/activitypub/replies_controller.rb

app/controllers/api/proofs_controller.rb

app/controllers/application_controller.rb

app/controllers/concerns/account_controller_concern.rb

app/controllers/concerns/account_owned_concern.rb

app/controllers/concerns/status_controller_concern.rb

app/controllers/custom_css_controller.rb

app/controllers/emojis_controller.rb

app/controllers/follower_accounts_controller.rb

app/controllers/following_accounts_controller.rb

app/controllers/home_controller.rb

app/controllers/intents_controller.rb

app/controllers/manifests_controller.rb

app/controllers/media_controller.rb

app/controllers/public_timelines_controller.rb