Add references to command modules

Often command module descriptions contain HTML (which kinda sucks).

This is occasionally used for formatting, which is fine.

There are many instances where the description only uses HTML to include links.

It would make much more sense to define a `references:` key in the module config YAML file to contain an array of reference URLs.

The admin UI should also be updated to display the reference URLs.

Start by locating how command module YAML configuration is loaded and how descriptions are rendered in the admin UI. Add support for a references array of URLs in module configuration and display those URLs in the admin UI; done means link-only HTML descriptions can be represented through references and the links appear for administrators.

Written by the indexing model from the issue text.