refactor content card css
Merge branch 'content-cards' of github.com:guardian/frontend into content-cards

* 'content-cards' of github.com:guardian/frontend: (71 commits)
  adding data file
  remove newlines and stuff
  adds content card switch and removes unneeded field from json
  added controller test for content cards
  Add More Email Logging
  Increase max fronts to 500
  quotes for json object
  Fixed weird spelling
  Added note for people editionalising sections
  Rename Debug Job
  prioritise blog tags over series tags
  validation fix
  use button styles
  Add Logging
  Upgrade the videojs ads framework
  Reinstate snapHref for headline links
  Add technology as an editionalised section
  Unhide the reverter and length indicator
  Add tests that deduplication happens correctly
  Don't Depend on a Switch During Startup
  ...