fix deprecation warning in the start

[NamitBhutani]

What kind of change does this PR introduce?

bugfix

Issue Number:

Fixes #1235

Did you add tests for your changes?

not needed

If relevant, did you update the documentation?

no

Summary

Improved current custom webpack config setup to remove the deprecation warnings

Does this PR introduce a breaking change?

no

Have you read the contributing guide?

Yes

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3624dc8) 97.35% compared to head (f17377d) 97.39%.
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1449      +/-   ##
===========================================
+ Coverage    97.35%   97.39%   +0.03%     
===========================================
  Files          143      143              
  Lines         3588     3640      +52     
  Branches      1045     1073      +28     
===========================================
+ Hits          3493     3545      +52     
  Misses          90       90              
  Partials         5        5              

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