Add pre-commit hook configuration

[arnested]

• Fix markdownlinting issues
• Fix missing EOL
• Add pre-commit.com config

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 36.26%. Comparing base (8ef410f) to head (bdffbdc).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #506   +/-   ##
=======================================
  Coverage   36.26%   36.26%           
=======================================
  Files           7        7           
  Lines         284      284           
=======================================
  Hits          103      103           
  Misses        176      176           
  Partials        5        5           

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