Set up GitHub pages Jekyll site to get started with content

[stubailo]

The only drawback of GitHub pages is the lack of support for versioning, but we don't need that to get started writing content.

• Set up gh-pages branch and make that the default branch
• Initialize basic Jekyll site with a basic sidebar/table of contents layout
• Import the guide outlines to create a skeleton site
• Set up "Edit this page" buttons

[stubailo]

Going to obsolete this pending #3