Prep for frontend/editor css merge

Before I can merge the css of frontend and editor, a few housekeeping tasks need to be completed:

1. manually look at css resets - load normalize first

2. remove duplicate css statements with postcss-discard-duplicates

3. remove any border-box: box-sizing css from frontend and editor - is messing up width of components

4. combine css in a bundle, by opening app/index.js and importing ./editor/index.css (frontend.js imports editor entry point)

5. and fix any css issues that occur from the above actions