All the layouts are in the src/layouts directory.
base.j2, with the navbar and footer in frag/nav.j2 and frag/footer.j2 directories.
  The main theme is based of the standard Bootstrap example.X Y are numbers giving the size of the main and the right columns respectively.
  I only regularly use layouts/jumbotron93.j2, so can not guarantee completeness of the other jumbotron layouts.nav_column from any child template gets put on the right as a navigation column.
  Also if the variable toc is set, then the contents of this variable will be used of the table of contents, provided it doesn’t contain an empty list of the form <ul></ul>.nav-left.j2 and nav-right.j2. They use the Bootstrap affix plugin to make the navigation column stay sticky when you scroll down.All the markdown layouts are named in the form md-XXX.j2.
They will be documented shortly.
(Use the source, Luke.)