Improvements for Regression Models with Ordered Categorical Outcomes Notebook

[mihagazvoda]

Notebook title: Regression Models with Ordered Categorical Outcomes
Notebook url: https://www.pymc.io/projects/examples/en/latest/generalized_linear_models/GLM-ordinal-regression.html

Issue description

Improve the notebook:

• improve styling of latex equations
• replace univariate_ordered with ordered
• improve random values generation

[twiecki]

Want to do a PR?

[mihagazvoda]

Yes, will open it later today. Thanks! Done!