This was based on Garth's design but Adam asked me to tweak the typography.
More tweaks.
Merge branch 'master' of https://github.com/adobe/brackets into larz/quick-doc-tweaks
Updated based on @peterflynn's review.
Missed a spot
Restore previous 70/30 split between scrolling part of CSS docs and summary
part -- looks better on desktop-sized monitors, but still looks ok even at
half the width of a MBP screen.
Merge pull request #3618 from adobe/larz/quick-doc-tweaks

Larz/quick doc tweaks