Implement nbsphinx pro- and epilogue configuration

[marscher]

Context

NBSphinx supports prepending a jinja2 rendered pro- and epilogue to the output. See https://nbsphinx.readthedocs.io/en/0.3.0/prolog-and-epilog.html

Proposal

I wonder if it'd be easily possible to implement this as well in MyST-NB. What would be a good starting point inside the code base?

Tasks and updates

No response

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