music player improvements part 3

[JoshuaVSherman]

• [x] share url
• [x] copy to clipboard or cancel
• [x] page renders with song id in url
  • [x] also remove category title
  • [x] also remove category buttons
  • [x] also remove next and prev buttons
  • [x] also adds a button to navigate back to the songs page in regular view
• [x] cleanup code where commented out
• [x] fix codeclimate
• [x] fix unit tests