Added links to many categories, added Yeoman box

Added links for many categories, namely three CSS links, 2 Sublime Text
links, 1 jQuery link, 1 LESS link, 3 SASS links, 3 Grunt Links, and 1
Regex link.

If you wish to remove specific links, feel free to comment.

**EDIT**: Also, added box for [Yeoman](http://yeoman.io/).