Adding .sidebar_nav, new grays, changed navbar color to DOBT blue

[jrubenoff]

[ajb]

This component looks great!

One more small comment:

Also, the -webkit-font-smoothing makes the text look a lot lighter for me. (I'm about to go read up on this CSS property...) On my external monitor, especially, it gets kinda hard to read.

[ajb]

Here's what it looks like on my non-retina display, although I'm not sure how much screenshot is gonna capture it:

[jrubenoff]

Alignment issues should be fixed.

Font smoothing is best for small, bold text or light text against a dark background, so I changed this to only apply to the headers. List items should be easier to read now.

[ajb]

:bomb: :ship: