chore: Port docs from Sphinx to Zensical

[jodal]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.85%. Comparing base (303f7a4) to head (3c60cd1).

Files with missing lines	Patch %	Lines
src/comics/core/comic_data.py	0.00%	8 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #675   +/-   ##
=======================================
  Coverage   59.85%   59.85%           
=======================================
  Files          41       41           
  Lines        2035     2055   +20     
=======================================
+ Hits         1218     1230   +12     
- Misses        817      825    +8     

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