Remove gddo-admin.
Sidebar navigation for package documentation.

TODO:

 * Removing container width constraint makes non-package pages too wide.
   Wrap other pages in a new class?
 * scrollspy not _quite_ configured correctly, need to tune
   pixels-from-top to get it exaclty right
 * Should inspect & drill down into Introduction section
Constrain non-package pages to original 728px width.

Constrain package pages to 728px + width of sidebar.