We will introduce a new module `mediawiki.action.styles` which provides styling for all the action= URIs (with the exception of action=view). This will keep styles needed for pages such as action=info, action=protect, action=edit, action=preview, action=delete and action=watch separated from the critical path, as well as provide better support in skins such as Minerva that do not provide such styles for performance reasons.
# Acceptance criteria
 A module `mediawiki.action.styles` exists
 The module `mediawiki.action.styles` is added to any page where `Action::getActionName( $this->getSkin() ) is 'view', or falsey.
 The module should load on all skins and have targets mobile and desktop.
 Relevant styles from the legacy feature are moved to the `mediawiki.action.styles` module organized and documented to which actions they apply to.