Update notebook Regression Models with Ordered Categorical Outcomes

[mihagazvoda]

Issue 577

As a part of PyData Amsterdam PyMC sprint, I updated the notebook. I improved:

• random values generation;
• styling of math equations;
• replaced univariate_ordered with ordered
• filtered future warnings coming from pandas.

Note that pre-commit checks also affected a few other files.

• [x] Notebook follows style guide https://docs.pymc.io/en/latest/contributing/jupyter_style.html
• [x] PR description contains a link to the relevant issue:
  • a tracker one for existing notebooks (tracker issues have the "tracker id" label)
  • or a proposal one for new notebooks
• [x] 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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[OriolAbril]

I have rebased on main, and I think the warnings have all been fixed already by the respective libraries. However the notebook still needs to be executed start to end