This is now a jekyll site

We can keep writing the site in .md and jekyll will handle html
generation with a shared layout that includes piwik tracking.
More updates for jekyll compatibility
Update emails to link to cryptobot.org.
Restore h1s
work on layout
Add some description to index page
Fix typos
Add github-flavored css for rendering markdown like on github
Merge pull request #39 from EFForg/jekyll

/doc is now a jekyll site, which can be built via `jekyll build`