require nanoc gem
Move static assets into `static` dir, hook into guard, ignore fonts

* static assets (like stylesheets and images) belong in the `static`
  directory
  * Followed this guide: http://nanoc.ws/docs/troubleshooting/#error-found-3-content-files-for-x-expected-0-or-1
* Guard now recompiles the site if static assets are changed
* Ignore the contents of the `static/fonts` directory. This is to
  prevent licensisng issues with the fonts we have purchased.