Create blank react app with lib as packages

[jeanlescure]

Create a blank (or "hello world") create-react-app base that loads in port 3030 and contains a copy of the current README.md (updated as needed).

The sub-packages we've currently built have quality code. Let's scrap the lib convention and use a more traditional packages directory. Save as much code as possible. Toss the rest into the wind 🍃

Be sure to revise the yarn link strategy implemented in setup:dev npm script.