Miscellaneous documentation changes

1. re Issue: #72.  Added a "Front Page" to the Table of Contents, which points to the front page of the document (_i.e._ index.html).

I've wrapped it up into a separate `<ul>` (there doesn't seem to be a way of changing the toctree directly without causing other problems), and made the entry slightly darker than the rest to distinguish it slightly.

2. Added a python 3 version of the "cheap web server" to view the built html documentation.

3. Issue #376.