chore(repo): rename docs dir

[renefloor]

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Description of the pull request

pub publish complained about docs folder, renamed to doc now.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.05%. Comparing base (4c1fbcd) to head (ca0da48).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #12   +/-   ##
=======================================
  Coverage   87.05%   87.05%           
=======================================
  Files           4        4           
  Lines         170      170           
=======================================
  Hits          148      148           
  Misses         22       22           

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