Use MyST-NB for Jupyter Notebook Publishing

[amotl]

About

MyST-NB is a Sphinx and Docutils extension for compiling Jupyter Notebooks into high quality documentation formats.

It is a module within the Executable Books Project, an international collaboration to build open source tools that facilitate publishing computational narratives using the Jupyter ecosystem. It is also a core component of Jupyter Book.

-- https://myst-nb.readthedocs.io/