docs: add tips on contributing

[euri10]

Description

• wanted to address the fact we may have more and more llm-based PRs
• cleant some really old stuff while looking at that
• added some "tips", very open on this ymmv

Closes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.93%. Comparing base (6ce617e) to head (cb8c0ce).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4391      +/-   ##
==========================================
- Coverage   97.93%   97.93%   -0.01%     
==========================================
  Files         319      319              
  Lines       15586    15583       -3     
  Branches     1726     1726              
==========================================
- Hits        15264    15261       -3     
  Misses        184      184              
  Partials      138      138              

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[github-actions]

Documentation preview will be available shortly at https://litestar-org.github.io/litestar-docs-preview/4391

[euri10]

on the topic of llm and the warning, does someone know if there is a way to autoshutdown them ?
might be a good feature that github will definitely love ⚰️