brand new site
manually resynch with some unmerged changes
Merge branch 'master' of https://github.com/bvschwartz/urbit.github.io

# By Bruce Schwartz (1) and others
# Via Bruce Schwartz (1) and others
* 'master' of https://github.com/bvschwartz/urbit.github.io:
  make jekyll happy
  Various fixes and improvements.
  minor nits, pt2