Create a comprehensive `conf.py` reference

# Background

Currently, the `conf.py` values used by the Starter Pack are only documented through code comments. These comments don't comprise a complete reference and clutter up the `conf.py` file itself.

The comments in `conf.py` provide versioned, important details about the file. However, they should be limited to the _essential details_ of each value. We should not be providing explanatory information or using them in place of proper documentation.

# Request

* Document each of the configuration values used by the Starter Pack
* Remove _non-essential_ comments from the `conf.py` file and instead link to the aforementioned page