removing ex-reps from the /people page

One thing I hate about Cooper's Trustees pages is that their profiles
disappear when they leave. You can still access these guys'es profiles
if you followed a link, but they're not listed anywhere (yet…maybe not
necessary).
moving things to /about section

moved constitution off homepage to /about/constitution, moved
committees from header to /about/committees, added dynamic list of
relevant notes below each committee, tagged some notes (so they show up
on /about/committees page), added /about/this-site with a live code
browser