Add option to disable swiping motions across the WebUI (#13885)

app/controllers/settings/preferences_controller.rb

...odon/features/getting_started/components/announcements.js

app/javascript/mastodon/features/introduction/index.js

...avascript/mastodon/features/ui/components/columns_area.js

...javascript/mastodon/features/ui/components/media_modal.js

app/javascript/mastodon/initial_state.js

app/lib/user_settings_decorator.rb

app/models/user.rb

app/serializers/initial_state_serializer.rb

app/views/settings/preferences/appearance/show.html.haml

config/locales/simple_form.en.yml

config/settings.yml