Remove App.css because it will be auto-generated

[divyamrastogi]

Fixes App.css indentation issue

Checklist

• [x] I have read the Contribution & Best practices Guide and my PR follows them.
• [x] My branch is up-to-date with the Upstream master branch.
• [x] I have added/updated necessary tests/documentation (if applicable)

Changes proposed in this pull request:

-

[PrabhanshuAttri]

LGTM. Thanks @divyamrastogi