Add new tutorial on how to run pathfinder from pymc-experimental.

[twiecki]

Tutorial on how to run pathfinder VI

• Notebook follows style guide https://docs.pymc.io/en/latest/contributing/jupyter_style.html
• PR description contains a link to the relevant issue: a tracker one for existing notebooks or a proposal one for new notebooks
• Check the notebook is not excluded from any pre-commit check: https://github.com/pymc-devs/pymc-examples/blob/main/.pre-commit-config.yaml

Helpful links

• https://github.com/pymc-devs/pymc-examples/blob/main/CONTRIBUTING.md

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[twiecki]

Not sure why ci is failing. @OriolAbril any ideas?

[twiecki]

I really can't figure this out, there's no reference to www.pymc.io.

[twiecki]

Rebasing fixed it.

[drbenvincent]

Looks fine to me. But any changes required given the rename of the pymc-experimental repo? E.g in the import statement?

[OriolAbril]

I love the style and how concise and to the point the notebook is

[OriolAbril]

Still missing the page footer thing that has the license info and citation advise: https://docs.pymc.io/en/latest/contributing/jupyter_style.html#epilogue, but looks great otherwise. Pre-emptively approving so you can merge after adding that.