To uninstall yaws-yapp just follow these instructions.
sudo apt-get remove yaws-yapp
This will remove just the yaws-yapp package itself.
sudo apt-get remove --auto-remove yaws-yapp
This will remove the yaws-yapp package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for yaws-yapp then this will work.
sudo apt-get purge yaws-yapp
Or similarly, like this yaws-yapp
sudo apt-get purge --auto-remove yaws-yapp
|Maintainer||Ubuntu Developers <firstname.lastname@example.org>|
|Description||Provides an easy way to deploy applications for Yaws web server|