docs: have a badge per license

[CosmicHorrorDev]

i noticed that this badge was a bad link since it's pointing to a non-existent LICENSE file, so i switched it to two badges -- one per license file

alternatively we could have some sort of COPYING file that states the dual licensed nature and point to that

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.89%. Comparing base (08db7df) to head (11d66b0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #168   +/-   ##
=======================================
  Coverage   77.89%   77.89%           
=======================================
  Files          27       27           
  Lines        2714     2714           
  Branches      134      134           
=======================================
  Hits         2114     2114           
  Misses        531      531           
  Partials       69       69           

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