notebook: GLM Poisson regression, update header and footer

[reshamas]

References

• Towards #394

• Towards #86

• References pymc-devs/pymc #5460 (Update example gallery style and formatting)

• References Project Board: https://github.com/pymc-devs/pymc-examples/projects/1

• [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 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

DataUmbrellaPyMCSprint

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