- Use modern implementation of Sphinx themes both locally and on RTD. This requires enabling RTD as follows:
    - Advanced Settings
        Install Project:
          Install your project inside a virtualenv using setup.py install

        Requirements file:
          rtd.txt

- use datetime for current year in copyright
- use current URLs for intersphinx
- don't use smartquotes

setup.py - add docs_extra for ease of installing docs on RTD and for future possible CI on Travis
rtd.txt - See above. Will install docs extras on RTD