Issue #459-#460: Fixed asset building issues

[alexmerlin]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.53%. Comparing base (72a20f2) to head (43a3a7e).

Additional details and impacted files

@@            Coverage Diff            @@
##                7.0     #461   +/-   ##
=========================================
  Coverage     38.53%   38.53%           
  Complexity      925      925           
=========================================
  Files           169      169           
  Lines          3768     3768           
=========================================
  Hits           1452     1452           
  Misses         2316     2316           

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[alexmerlin]

For #459 I required terser-webpack-plugin into package.json.
For #460 I applied @marioradu05's fix he used in a different project.

The new build completed successfully, the Admin works as expected.

@GeorgeCatalinStan please take a look at the fix in webpack.config.js and let us know if it's ok or if you have a better solution.