Farewell

This adds a farewell notice to the home page and removes everything else.

cc @jonmagic @mikefowler for copy/deployment feedback.

cc @marcyDel since we're linking to CoderDojoSV

![screen shot 2014-05-29 at 9 42 29 am](https://cloud.githubusercontent.com/assets/72919/3120362/6271352a-e750-11e3-8d04-9ac5d9eab09a.png)