Revert "add libraries"

This reverts commit 825e42454ed0964b8b353912b67ac7475096f121.
Revert "replace hello.py"

This reverts commit d33c8bc7ad964051dbdd936fab4212907ae27896.
Revert "deploy to heroku"

This reverts commit 0970af5ec06ac163ab44b5780a00021636fd2ffc.