docs: replace commitizen with git cliff

[JP-Ellis]

📝 Summary

Replace commitizen with git cliff for generating changelogs.

🚨 Breaking Changes

🔥 Motivation

I find git cliff nicer to use, and has better features.

🔨 Test Plan

There are changes to the release process which, unfortunately, won't be tested until the next release.

🔗 Related issues/PRs

• None

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77%. Comparing base (ded5bc8) to head (700a4f9).
Report is 2 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #938   +/-   ##
===================================
  Coverage    77%    77%           
===================================
  Files        31     31           
  Lines      3668   3668           
===================================
  Hits       2859   2859           
  Misses      809    809           

Flag	Coverage Δ
examples	57% <ø> (ø)
tests	77% <ø> (ø)

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