v0.2.3

Changed

• Extension documentation and user-facing verbiage updates.
• Broadened the ad-skip button detection: the query is no longer scoped to
  #movie_player (newer player variants render the skip button outside it) and
  visibility is now checked via getBoundingClientRect so a skip button under a
  position: fixed ancestor is still recognized. The button is still only clicked
  once it's actually visible to the user.