refactor(GreenRoom) refactor render for CreateRoom
refactor(GreenRoom) refactor render for CreateRoom

Simply move code into separate methods, as variables inside of the
regular render method. This highlights the rendering logic much more
easily and cleans up a lot of clutter. There may be a slight performance
hit, because things are encapsulated as functions now. But I think it
will not be noticable and the clarity gains are much more important.

NerdDiffer/reprise,NerdDiffer/reprise,NerdDiffer/reprise