Add some basic docs around releasing the theme.

This just covers the basic tasks that I know need to happen,
feel free to suggest other improvements.

Bug fix release 0.2.4

Bug fix release 0.2.3

Bump version to 0.2.2

Bugfix release 0.2.1

Bump version

Pre-release for 0.1.10

* Removes Sphinx dependency
* Fixes hamburger on mobile display
* Adds a body_begin block to the template

0.1.9 Release

Changes:

* Intermittent scrollbar visibility bug fixed. This change introduces a
  backwards incompatible change to the theme's layout HTML. This should only be
  a problem for derivative themes that have overridden styling of nav elements
  using direct decendant selectors. See readthedocs#215 for more information.
* Safari overscroll bug fixed
* Version added to the nav header
* Revision id was added to the documentation footer if you are using RTD
* An extra block, ``extrafooter`` was added to allow extra content in the
  document footer block
* Fixed modernizr URL
* Small display style changes on code blocks, figure captions, and nav elements

Release v0.1.8

* Support for third and fourth level headers in the sidebar
* Add support for Sphinx 1.3
* Add sidebar headers for :caption: in Sphinx toctree
* Clean up sidebar scrolling behavior so it never scrolls out of view