Convert CSS to Scss files

[NishantJawla]

Added node-sass@4.14.1 package to run SCSS. [The latest version of node-sass is not compatible]. changed files from CSS to SCSS and changed all the SCSS file address used

What is the change?

    Convert CSS to Scss files

What does it fix/add?

    Can now use SCSS which provide more features than CSS 

How was it tested?

    Tested by running in the browser

Submissions guide:

• [Not Required ] Have you made corresponding changes to the documentation?
• [Yes ] Your submission doesn't break any existing feature.
• [Yes ] Have you lint your code locally prior to submission?

Screenshots (if appropriate):

[welcome[bot]]

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[NishantJawla]

@sansyrox Please check this pull request.

[welcome[bot]]

Congrats on merging your first pull request! 🎉 All the best for your amazing open source journey ahead 🚀.

[sansyrox]

Looks Good! Good Job!