Address example notebook formatting issues

[Andy-Grigg]

Closes #804

• Fix some incorrect notebook formatting, probably as a result of upgrading jupytext
• Revert the bump to plotly, which was causing plots to fail to render in HTML generated from notebooks

I did not modify the sustainability notebook which was the trigger for the underlying issue, this is fixed in #803

TODO:

• Identify underlying issue with plotly update and create Issue in plotly repo if necessary. I initially thought Fix issue breaking fig.write_image() plotly/plotly.py#5193, but this was already included in the version we upgraded to. - Created Notebook to HTML conversion not rendering plots with plotly >=6.1 #807

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.88%. Comparing base (b09c4f9) to head (3961afc).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #805   +/-   ##
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  Coverage   97.88%   97.88%           
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  Files          28       28           
  Lines        3124     3124           
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  Hits         3058     3058           
  Misses         66       66           

Flag	Coverage Δ
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integration-ubuntu-latest-TEST_SERVER_25R1_URL	81.37% <ø> (ø)
integration-ubuntu-latest-TEST_SERVER_25R2_URL	87.54% <ø> (ø)
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unittests	97.53% <ø> (ø)

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[Andy-Grigg]

Going through the process manually (i.e. creating an ipynb from the .py file in jupyter, running the example, then exporting to HTML) seems to work, although it generates static plots instead of the interactive ones we get currently.

I think there's some more investigation needed to resolve this. To unblock us though, I think we should merge this, and I'll create a separate issue to investigate what's going on with plotly >=6.1.

I don't think it's necessary to pin to an earlier version in pyproject.toml, since plotly still works when running the examples. It's just that as part of our CI, it doesn't do what we expect.