Update/Standardize Notebook: marginalized_gaussian_mixture_model

[AmitKus]

1. Fix: AttributeError: 'Rectangle' object has no property 'normed'
2. Format the notebook according to the style guide
3. Use arviz plotting functionalities

Depending on what your PR does, here are a few things you might want to address in the description:

• what are the (breaking) changes that this PR makes?
• important background, or details about the implementation
• are the changes—especially new features—covered by tests and docstrings?
• consider adding/updating relevant example notebooks
• right before it's ready to merge, mention the PR in the RELEASE-NOTES.md

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Codecov Report

Merging #4097 into master will not change coverage.
The diff coverage is n/a.

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  Coverage   88.48%   88.48%           
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  Files          88       88           
  Lines       13865    13865           
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  Hits        12268    12268           
  Misses       1597     1597           

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MarcoGorelli commented on 2020-09-12T07:46:55Z
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Where it says

is available here

and it links to https://raw.githubusercontent.com/pymc-devs/pymc3/65b6b6438bd3e1389f58600db30b86f2a84d6dac/docs/source/notebooks/gaussian_mixture_model.ipynb , could the link be to https://nbviewer.jupyter.org/github/pymc-devs/pymc3/blob/master/docs/source/notebooks/gaussian_mixture_model.ipynb instead?

AmitKus commented on 2020-09-13T00:32:52Z
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Done. Thanks.

[AmitKus]

Done. Thanks.

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[AlexAndorra]

Looks good, thanks @AmitKus !