Enable bibtex references in the documentation

[drbenvincent]

• This PR enables you to use bibtex references in the documentation.
• Extension changes: This is done through sphinxcontrib.bibtex, but we also now use myst_nb (see https://myst-nb.readthedocs.io/en/latest/index.html) and no explicitly use nbsphinx or myst_parser.
• That change to use myst_nb also allowed us to use simpler admonitions, so this was changed in all the relevant example notebooks.
• Default behaviour is to collect all references (site wide) into a single reference section. But because the site is / will be heavy with example notebooks then it makes sense to keep references at the end of each notebook. This is the same style as the pymc-examples repo.
• This will close Enable bibtex references in the docs #214.

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