Created a PyQt5 based gui for launching live editors in the browser
There was lots of discussion in #110 (closed) about what framework to use for the GUI.
Whatever we decided to use, the documentation editor would still to navigate like a full website, with a browser bar, forward and back buttons, etc. It was deemed best just to use the application to launch editors, but for editors to run in the browser.
As we were building a simple app it seemed easiest just to use PyQt5.
Closes #110 (closed)