Consider myst for doc rendering

@bsipocz has had success with using myst, in combination with sphinx, for readthedocs rendering.

This would enable notebooks to be source-controlled as markdown files, instead of hard-to-read ipynb.

Start by reviewing the current Sphinx and Read the Docs rendering setup, then assess how Myst would handle the project's notebooks. Confirm whether notebooks can be source-controlled as readable Markdown files and rendered successfully through the documentation build; done means the proposed workflow works without relying on hard-to-read ipynb sources.

Written by the indexing model from the issue text.