Fix npm publish to use correct registry

[asabaylus]

Add publishConfig to package.json to explicitly specify npm registry.
This prevents npm from trying to publish to the yarn registry.

Fixes authentication error where npm was attempting to publish to
https://registry.yarnpkg.com instead of https://registry.npmjs.org

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (ca9688e) to head (013df6f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1614   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          238       238           
  Branches        47        47           
=========================================
  Hits           238       238           

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