Single column layout

@donnapep @settinghead @alex-deaconu FYI, this is a branch that was ready for a PR just prior to us switching to Widget CI work. I'm going to go ahead and immediately merge it because I want to fork my own copy of the master of this repo and I want to ensure it includes the latest. Everything is going to get re-factored to Angular, build process, testing, etc, etc, so I don't feel this needs an actual review.