binning notebook

[OriolAbril]

Notebook url: https://github.com/pymc-devs/pymc-examples/blob/main/examples/case_studies/binning.ipynb
reviewer: drbenvincent, ericmjl

[cuchoi]

Working on this one

[cuchoi]

Can this be moved to v4 (auto)? It was referenced in #209 but I think #366 takes care of that? @drbenvincent

[drbenvincent]

Done :)

[PrinceAsiedu]

Working on this
@reshamas

[PrinceAsiedu]

I think I have to move to another notebook because this already has the opening and closing cells I intended on adding to the notebook
@reshamas