upgrade: add sass instead of node-sass

[NamitBhutani]

What kind of change does this PR introduce?

dependency upgrade

Issue Number:

Fixes #1503

Did you add tests for your changes?

not needed

If relevant, did you update the documentation?

CODE_STYLE.md updated

Summary

node-sass is deprecated and is causing build errors. We should use sass instead.

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 ✅

Project coverage is 97.39%. Comparing base (4b01054) to head (09e4a6b).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1665      +/-   ##
===========================================
- Coverage    97.48%   97.39%   -0.09%     
===========================================
  Files          157      168      +11     
  Lines         3854     4148     +294     
  Branches      1140     1206      +66     
===========================================
+ Hits          3757     4040     +283     
- Misses          93      105      +12     
+ Partials         4        3       -1     

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[rishav-jha-mech]

@NamitBhutani

1. Update the documentation about how to use this package
2. Revert any unnecessary changes you make to Markdown files

[NamitBhutani]

@NamitBhutani

1. Update the documentation about how to use this package

2. Revert any unnecessary changes you make to Markdown files

Done!

[rishav-jha-mech]

src/assets/css/app.css.map

Add the documentation for debugging for this file too