Deploy it! It’s alive!!!

This branch successfully deploys to Heroku — it’s online at [node-dc.herokuapp.com](http://node-dc.herokuapp.com) (and eventually, if we decide it’s good enough, at our .com address.

Had to do a bunch of shuffling around to get the app to deploy — check it. 
These must be referenced locally (as they’re not available in Heroku’s deploy environment).