notebook: model_averaging; update header and footer

[reshamas]

References

• Towards Update example notebooks for better rendering #394
• Closes model averaging #67
• References pymc-devs/pymc #5460 (Update example gallery style and formatting)
• References Project Board: https://github.com/pymc-devs/pymc-examples/projects/1

• Notebook follows style guide https://docs.pymc.io/en/latest/contributing/jupyter_style.html
• PR description contains a link to the relevant issue: a tracker one for existing notebooks or a proposal one for new notebooks
• 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

Notes for the Reviewer

• There are two references to "model_comparison.ipynb" and the link is broken. I cannot find this notebook.
• I changed mentions of "PyMC3" to "PyMC". Is that ok?

#DataUmbrellaPyMCSprint

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