attempting to modularize this code
Starting to refactor code. The menu buttons can be built.
Refactor: Menu now appears, CSS for list items temporarily deprecated
Refactor / can use any selector as a base for editing (including divs).
Button functionality is temporarily missing.
Height of editor window is set to "auto" for divs
Functionality for editor is almost complete. Split-screen and headers are broken
Editor is now in a usable albeit janky state.
 - CSS was changed to style the buttons
 - Listeners for buttons are back in place
 - index.html now uses a 'div' (for testing)
Minor cleanup, added highlighting to buttons
TIL: "var" is a very important keyword in Javascript.
Try sprinkling 'var' in your soups and casseroles for a real kick!