Administer PX-Central on-premises

Uninstall PX-Central on-premises

Uninstall PX-Central by downloading and running a script which cleans up both Portworx and PX-Central.

WARNING: This script removes all Portworx and PX-Central installations on the Kubernetes cluster.

Download and the PX-Central install script:

curl -o px-central-cleanup.sh 'https://raw.githubusercontent.com/portworx/px-central-onprem/1.0.3/cleanup.sh'

Run the script to clean up Portworx and PX-Central:
```
./px-central-cleanup.sh
```