This part of the documentation covers the installation of Sphinx Readability Theme.
To use this style in your Sphinx documentation, follow this guide.
Installing this theme is simple with pip:
$ pip install sphinxtheme.readability
Or, with easy_install:
$ sudo easy_install sphinxtheme.readability
Add this to your conf.py:
import sphinxtheme
readability_path = os.path.dirname(os.path.abspath(sphinxtheme.__file__))
relative_path = os.path.relpath(readability_path, os.path.abspath('.'))
html_theme = 'readability'
html_theme_path = [relative_path]