Adds simple script for easier publishing

Adds .nojekyll to switch off jekyll on gh-pages
Adds _config.yml with basic config for jekyll and publish script
Adds _source directory where website source lives
Adds _site directory where jekyll generates website from source
Adds script for easy publishing publish.rb
Script generates website using jekyll and copies _site/* into .
so gh-pages can display that without active jekyll on gh-pages