split sitemap into chunks, better sitemap template

[oiwn]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 72.52747% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 34.18%. Comparing base (83fa384) to head (850da32).
⚠️ Report is 18 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main.rs	0.00%	20 Missing ⚠️
src/server/handlers.rs	92.95%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
+ Coverage   33.66%   34.18%   +0.52%     
==========================================
  Files          31       31              
  Lines        3998     4057      +59     
==========================================
+ Hits         1346     1387      +41     
- Misses       2652     2670      +18     

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