Example usage of the derby CodeMirror component.
This component depends on the CodeMirror library, and needs to serve up some of it's static content. See server.js where we let derby (and hence express) know about the static folder we want.
For a full CodeMirror deployment (using modes and themes) you will want to serve up some more static content from the CodeMirror repo. At that point you will want to replace derby-starter with your own instanciation of a derby app.