Migrate documentation to use Zensical instead of MkDocs

[tleonhardt]

Migrate documentation to use Zensical instead of MkDocs with the Material theme. Zensical is essentially "MkDocs 2.0" and is backwards compatible.

I decided not to try to migrate to a zensical.toml file at this point as zensical fully supports directly using the configuration in mkdocs.yml and Zensical has on their roadmap a tool for automatically converting the config file for you.

The developer experience of using Zensical is awesome as it has a much faster reload time for the static site after updating documentation.

TODO:

• Fix ReadTheDocs build to work with zensical (I also migrated it to use uv instead of pip in the process)

[github-actions]

🤖 Hi @tleonhardt, I've received your request, and I'm working on it now! You can track my progress in the logs for more details.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.94%. Comparing base (c7367d6) to head (e088723).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1557   +/-   ##
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  Coverage   98.94%   98.94%           
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  Files          21       21           
  Lines        4942     4942           
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  Hits         4890     4890           
  Misses         52       52           

Flag	Coverage Δ
unittests	98.94% <ø> (ø)

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[github-actions]

📋 Review Summary

This Pull Request successfully migrates the documentation system from MkDocs to Zensical. The changes are consistent across configuration files, workflow definitions, and documentation content, demonstrating a thorough transition.

🔍 General Feedback

• The updates to dependency groups in pyproject.toml correctly reflect the new documentation tool, removing obsolete packages and adding zensical.
• Documentation files and scripts have been consistently updated to refer to Zensical, ensuring accuracy and coherence.
• The change to use linked references in docs/features/argument_processing.md is a good improvement for documentation usability.