Storybook - cleanup css

[Jaya-Rathore]

Issue : 408
Storybook cleanup the import
-Currently, every file in the stories folder has an import to /stories/style.css
-Storybook provide the ability to add that import only in the preview-head file

[codecov-commenter]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (9fa33d3) compared to base (7fbc70e).
Patch has no changes to coverable lines.

❗ Current head 9fa33d3 differs from pull request most recent head ba8e75d. Consider uploading reports for the commit ba8e75d to get more accurate results

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Additional details and impacted files

@@              Coverage Diff              @@
##           release/0.7      #418   +/-   ##
=============================================
  Coverage       100.00%   100.00%           
=============================================
  Files               45        45           
  Lines             1029      1029           
  Branches           400       400           
=============================================
  Hits              1029      1029           

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[daniele-zurico]

closing for now given we agreed to put more enhancements