docs: clarify babel plugin requirements in README

[stropitek]

Updated usage instructions for Babel configuration to clarify the need for additional plugins for destructuring and namespace exports.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.36%. Comparing base (6dc2d0d) to head (99584ae).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #13   +/-   ##
=======================================
  Coverage   98.36%   98.36%           
=======================================
  Files           1        1           
  Lines         122      122           
  Branches       40       40           
=======================================
  Hits          120      120           
  Misses          2        2           

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