mono - chore: upgrading docula

[jaredwray]

Please check if the PR fulfills these requirements

• Followed the Contributing and Code of Conduct guidelines.
• Tests for the changes have been added (for bug fixes/features) with 100% code coverage.

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
mono - chore: upgrading docula

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (f28808a) to head (3b0a266).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #175   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines         1034      1034           
  Branches       199       199           
=========================================
  Hits          1034      1034           

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[gemini-code-assist]

Code Review

This pull request upgrades docula to version 1.11.1 and updates the project configuration to align with the new version. Key changes include updating the website serve script, adding .cache to .gitignore, and enhancing site/docula.config.ts with TypeScript types and updated options. Additionally, site/variables.css was refactored to support theme switching with a new set of CSS variables. I have no feedback to provide as there were no review comments to assess.