Add Beta Regression Example

[tjburch]

Issue #369 requested a beta regression example. I've been playing around with that and putting together a sketch of one. This PR adds that notebook. There's a couple of problems within the example that need some comments, I'll notate these. If there's other suggestions where to go with it as well, I'm happy to adapt it. Right now it's heavy on two toy examples, and light on one real-world example reusing the baseball dataset.

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[tomicapretto]

Hi @tjburch

Thanks for this great contribution! A single example would have been sufficient, but this notebook having three examples ranging from very simple to more complex is amazing.

I've also left some comments trying to answer your questions. Let me know if I can help with anything else :)

[tjburch]

Awesome! Very much appreciate you taking a look over it. I'll get the ball rolling on those fixes.

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Codecov Report

Merging #442 (9d75d3d) into main (7d5a83f) will not change coverage.
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  Misses        257      257           

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[tjburch]

Just fixed up those changes, I also tightened up the language a bit in parts. If there's further comments that I can implement, let me know!

[tomicapretto]

I'm glad you are one step ahead of me and added your name on the top of the notebook :).

I'll try to review more in-depth tomorrow.

Thanks again for the contribution!

[tomicapretto]

@aloctavodia if you are happy with the changes, feel free to merge

[aloctavodia]

Thanks @tjburch, this is a great example.