refactor(docs): change theme and consolidate dependencies

[henry2004y]

This commit addresses several issues with the documentation and repository structure:

• Switches the Sphinx theme to pydata-sphinx-theme.
• Moves all documentation dependencies from docs/requirements.txt into a [project.optional-dependencies.docs] section in pyproject.toml for centralized dependency management.
• Deletes the now-redundant docs/requirements.txt.

[gemini-code-assist]

Summary of Changes

Hello @henry2004y, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the project's documentation setup by updating the Sphinx theme for a more modern appearance and consolidating all documentation-related dependencies into pyproject.toml. This change streamlines dependency management, removes a redundant requirements file, and ensures a consistent and maintainable build process for the project's documentation.

Highlights

• Documentation Theme Update: The Sphinx documentation theme has been switched from sphinx_rtd_theme to pydata_sphinx_theme in docs/conf.py to modernize the look and feel of the documentation.
• Centralized Dependency Management: Documentation-specific dependencies, previously listed in docs/requirements.txt, have been moved into a new [project.optional-dependencies.docs] section within pyproject.toml. This centralizes dependency management and aligns with modern Python packaging practices.
• Dependency File Removal: The docs/requirements.txt file has been removed as its contents are now managed through pyproject.toml.
• Development Environment Update: The dev optional dependency group in pyproject.toml has been updated to include the new docs group, ensuring that all necessary documentation build tools are available in the development environment.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.31%. Comparing base (4c8d077) to head (307873a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #161   +/-   ##
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  Coverage   68.31%   68.31%           
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  Files          25       25           
  Lines        4191     4191           
=======================================
  Hits         2863     2863           
  Misses       1328     1328           

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[gemini-code-assist]

Code Review

This pull request is a good refactoring that consolidates documentation dependencies into pyproject.toml and updates the Sphinx theme. This centralizes configuration and simplifies the project structure. My review includes one suggestion to add version pinning for the new documentation dependencies to ensure reproducible builds and prevent future breakages. Overall, a solid improvement.