Exclude storybook coverage

[Kilo59]

Exclude storybook files and update coverage thresholds.

• Extracted from fix: update readme, update codecov to exclude storybook #73

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.78%. Comparing base (768d8c4) to head (d08214d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #74   +/-   ##
=======================================
  Coverage   76.78%   76.78%           
=======================================
  Files          36       36           
  Lines         435      435           
  Branches       75       75           
=======================================
  Hits          334      334           
  Misses         77       77           
  Partials       24       24           

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