chore: Support notebooks in docs

[zilto]

The most straightforward avenue for creating a "Hamilton cookbook" would be to support rendering notebooks as pages via a Sphinx plugin. This would make it easier for people to browse examples from the documentation. Instead of supporting interactivity directly from the docs, notebooks can include a link to launch the page in a Google Colab if appropriate.

ref: https://docs.readthedocs.io/en/stable/guides/jupyter.html