Adding a class for FAQs and other groups of links.

Adding a class to be used for FAQs and other lists of links for further reading. I call it ".moreinfo"

Satisfying a small part of Bug #994029. I will communicate the class name and usage to Chris. 

There is a testing page (https://developer.allizom.org/en-US/docs/User:stephaniehobson:moreinfo) that you can copy to your local dev if you like.
Agree. Super minor, but might as well keep the convention we have established. The style guide also talks about this, not that we follow the style guide very closely.

> Write hex values in lowercase and, if possible, the shorthand notation, e.g. #ff0 is better than #FFFF00.

&mdash; [CSS Style Guide](http://mozweb.readthedocs.org/en/latest/css-style.html#general-guidelines)