Prettied up the index.html's tree output with LESS
renamed initializr-* to index-*, updated README.md

* Renamed initializr-*.html files to index-*.html to better show these
  are indeed the 'index' files you need to work with.
* Updated README.md to reflect these changes and other various
  updates and wording changes.
* Fixed small bug that prevented the inclusion of `style.less` in
  the actual listing of index.html, and also updated it to reflect
  rename changes.