Bump Sphinx version

[LucasMMota]

Why? :open_book:

The docs on Read the Docs site are not being built.

What? :wrench:

Bump local Sphinx to the version used in ReadTheDocs. update some docs to test building

Type of change :file_cabinet:

• [ ] Documentation

How everything was tested? :straight_ruler:

Locally

Checklist :memo:

• [ ] I have added labels to distinguish the type of pull request.
• [ ] My code follows the style guidelines of this project (docstrings, type hinting and linter compliance);
• [ ] I have performed a self-review of my own code;
• [ ] I have made corresponding changes to the documentation;
• [ ] I have added tests that prove my fix is effective or that my feature works;
• [ ] I have made sure that new and existing unit tests pass locally with my changes;

Attention Points :warning:

Replace me for what the reviewer will need to pay attention to in the PR or just to cover any concerns after the merge.

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

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