Added ESLint for better checks

Apply Sweep Rules to your PR?

[ ] Apply: All docstrings and comments should be up to date.
[ ] Apply: There should be no instances of commented out code.
[ ] Apply: All error logs should use traceback during exceptions.
[ ] Apply: There should be no instances of import pdb; pdb.set_trace() in production code.
[ ] Apply: There should be no debug log or print statements in production code.
[ ] Apply: All CSS files should be linked using the href attribute.