Docs/gr ndit 1731 fix issues in docs

[georgeRobertson]

TLDR of changes

• Fix some content issues in the docs
• Add python 3.12 classifier to pyproject.toml
• Upgrade Zensical to v0.46
• Add new ci/cd step to ensure that changes in docs are validated with new Zensical runtime arg --strict

What kind of changes does this PR introduce?

Tick all that apply

• fix: A bug fix. Correlates with PATCH in SemVer
• feat: A new feature. Correlates with MINOR in SemVer
• docs: Documentation only changes
• style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
• refactor: A code change that neither fixes a bug nor adds a feature
• perf: A code change that improves performance
• test: Adding missing or correcting existing tests
• build: Changes that affect the build system or external dependencies (example scopes: pip, docker, npm)
• ci: Changes to CI configuration files and scripts (example scopes: GitLabCI)

Please check if the PR fulfills these requirements

• I have read and followed the Contributing guidance
• Docs have been added / updated
• Tests and Linting in the CI are passing
• Changes have been reviewed and approved by a Project Maintainer

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud