Updated 3 survival notebooks to v5

[fonnesbeck]

Updates to 3 notebooks, added headers, footers and info.

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• Notebook follows style guide https://docs.pymc.io/en/latest/contributing/jupyter_style.html
• PR description contains a link to the relevant issue:
  • closes weibull AFT #129
  • closes survival analysis #128
• 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

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