Add script to generate letters to DOM
Add styles for generated letters
Add page to serve as game page
Move util functions under helpers folder
Move example scripts under hello folder
Change build

  - Add 'game' build, which builds play.js
  - Separate 'hello' build which builds the examples
  - Change the index.html to load hello.js
    instead of app.js
Add styles to play page
Add pause overlay to play page
Add simple random letter game with pause