Here's a rough start on unified collaborator docs

What I'm trying to do here is build a single documentation center for
all types of Gittip collaborators--developers, designers, managers,
customer support, etc., etc. I'm hoping to knit together literate
programming from many languages along with markdown/html files for
bigger-picture things. My focus so far has been on building nav
infrastructure (hopefully we'll be able to adapt it for use on
www.gittip.com itself). I've got the basic nav working, next up is
knitting in nav from other trees: css, js, python, www.