Modularise CSS files

[ShivanshKumar]

The CSS files should be put in proper folders and all of them should not be imported in _app.js

[AlanBlandon]

👋 Hello @ShivanshKumar May I work on this issue?

[ShivanshKumar]

Hey Alan, sure you can, we are currently having an intra-institute level contribute-a-thon, although you can contribute to our repos, you will not get any prizes. Other than that you are very welcome to work here!