Revert "Heroku push rejected."

This reverts commit 03c0019d848ea4c200a41bfbab58e6535436d946.
Revert "engines options added for Heroku."

This reverts commit b62c914f3856c27a9aa245fd2c4c956706fdf558.
Revert "Procfile for Heroku deployment."

This reverts commit d115cd75a1ed39c12cca57af1b71b45bd6a6ce42.