Add Wistia Basics to Doc index

Whoa crazy, we don't give folks links to the "Basics" series from the doc home. Whoops.

![screenshot 2014-02-07 14 46 11](https://f.cloud.github.com/assets/651753/2113695/974255da-9030-11e3-8787-3d9cecc2a27f.png)

Also, this adds some color to the doc home page, which looks awesome IMO.

w00t :dragon_face: