Remove redundant functionalities

[rathorevaibhav]

Describe the task
We have several functionalities like Grunt, package-lock.json, package.json, etc, which may not be needed at all to compile our extended SCSS files.
These functionalities can be deleted and the package should have only had relevant files.

Expected behavior

1. SCSS can be compiled via simple sass compile command.
2. Update readme for system dependencies like sass command etc.