remove a-la-carte addons from readme because they're not quite right
remove a-la-carte addons from readme because they're not quite right

appslingr/react-lite-rails,mikesea/react-rails,reactjs/react-rails,mikesea/react-rails,appslingr/react-lite-rails,mikesea/react-rails,reacuna/react-rails,appslingr/react-lite-rails,reacuna/react-rails,reactjs/react-rails,reactjs/react-rails,reactjs/react-rails,reacuna/react-rails