This makes the chat window flex-grow so we no longer need to manually
fix its height. It also cleans up some other styling.
It also fixes the scroll handlers so we detect when the user is at the
bottom of the chat window so we can follow the latest message. It also
fixes some circular references in the callbacks that were causing React
to bug out.
The migration tool we used didn't take into account our formatting
standards so I'm bulk-formatting the SCSS files to bring them back up to
our standards. Basically this just changes the tab size for all the
files.
