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
Create gh-pages branch with just the jekyll site
remove _site
Attempt to fix layout