The config-options.rst file contains the text of the configuration options from the main Cantera SConstruct file. To prevent it getting out of date, we should make a script that parses the SConstruct and writes the config-options.rst file.

The ast module will be useful since SConstruct is just a Python file. See also https://greentreesnakes.readthedocs.io/en/latest/

In the end, this should be turned into a plugin that runs on every bulid of the website.