This layout is first and foremost pulled in for the SQLAlchemy documentation builds (and possibly other related projects), but is also usable as a standalone theme / utility set for any project.

Features include:

* uses Mako templates instead of Jinja, for more programmatic capabilities
inside of templates
* layout includes an independently scrollable sidebar
* unique (to Sphinx) “contextual” sidebar contents that shows the current
page in context with all sibling pages
* modifications to autodoc which illustrate inherited classes, bases, method
documentation illustrates if a method is only inherited from the base or
overridden
* “dynamic base” feature that will, under ReadTheDocs, pull in optional
.mako and .py files from the website of your choice that will serve as an
alternate base template and a source of extra config setup, respectively,
allowing the layout to be integrated into the layout of an external site
when viewing on the web
* “viewsource” extension that can provide highlighted sourcecode to any
Python file arbitrarily
* SQLAlchemy-specific stuff, like the [SQL] popups, the dialect info
directives
* scss support using pyscss