Move docs to /docs and use Jekyll for GH Pages
Prepend baseurl to all URLs to prep for GH Pages

The site will be hosted under the path "/marathon" since this is a
project page. Ensure that path is prepended to any internal paths to
make links work.
Prettify some bash/console commands
Add titles to all pages
Link to Mesosphere homepage in the footer for attribution
Let docs columns collapse for small screens
Link to Mesos and Chronos in first appearance
Link to images properly with baseurl
Remove command line flags from README

That information now lives in the docs folder.
Clarify Docker with 'containers'
Correct some Markdown syntax errors
Use Montserrat to look like main site
Do a wee bit of styling
Specify sass_dir to appease GitHub Pages build
Style a bit darker to match inverse of Marathon
Add favicon and lighten code
Link to doc resources properly with baseurl
Add README for running the docs site locally
Add basic instructions for deploying gh-pages site
Merge pull request #471 from mesosphere/jekyll-docs-site

Move docs to /docs and use Jekyll for GH Pages