Added starring, liking, read/unread times
Fixed 'next article' navigation (will no longer reload page if no more
pages are available)
Feed header, minor UI tweaks

Added a 'subscriptions' icon
Added a feed header, clickable when a feed with a link is selected
Added hiding of feed title in list of articles when a feed (not a
category) is selected
Moved all 'js' files to 'content/js'
Moved all 'css' files to 'content/css'