Read The Docs and dependency upgrades

[JimMadge]

Summary

Fixes #3509 #3513
Supercedes #3512

Move book to ReadTheDocs build, updating packages.

Build from my fork is here

Important build changes

• Python 3.12
• Sphinx v5
• Jupyter Book v1

This will fail to build on the Netlify runner as that only has Python 3.8.

List of changes proposed in this PR (pull-request)

• Add ReadTheDocs configuration
• Update packages (removing DOS vulnerability)
• Adjust pathways command so it can be used as a pre-build step in rtd
• Pin requirements using pip-tools
• Fix build bugs

What should a reviewer concentrate their feedback on?

• Everything looks ok?

Acknowledging contributors

• All contributors to this pull request are already named in the table of contributors in the README file.
• The following people should be added to the table of contributors in the README file:

[netlify]

❌ Deploy Preview for the-turing-way failed.

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[aleesteele]

@JimMadge - Following up from Collab Cafe, I'll comment on the original issue with some suggestions about how to document our move to RTD!