If you want'to uninstall Ledokku there are multiple ways to do it:
Uninstall Ledokku and keep dokku running
As Ledokku is a simple dokku app, to uninstall the app itself and all of the associated data, you will need to just run these scripts on your server:
Uninstall both Ledokku and dokku
If you want to get rid of Ledokku and are fine with removing dokku from your server as well, follow this guide.