Remove outdated (rke-based) instructions on changing ip address

docs/maintenance.md

@@ -110,19 +110,6 @@ under `/var/lib/OpenAppStack/local-storage`.
 Restore instructions will follow, please [reach out to us](https://openappstack.net/contact.html)
 if you need assistance.
 
-
-## Change the IP of your cluster
-
-In case your cluster needs to migrate to another IP use these steps to make
-OpenAppStack and `rke` adopt it:
-
-* `rke etcd snapshot-save --config /var/lib/OpenAppStack/rke/cluster.yml --name test`
-* Change IP in `/var/lib/OpenAppStack/rke/cluster.yml`
-* `/usr/local/bin/rke up --config=/var/lib/OpenAppStack/rke/cluster.yml`
-* `rke etcd snapshot-restore --config /var/lib/OpenAppStack/rke/cluster.yml --name test`
-* `/usr/local/bin/rke up --config=/var/lib/OpenAppStack/rke/cluster.yml`
-
-
 ## Delete evicted pods
 
 In case your cluster disk usage is over 80%, kubernetes [taints](https://kubernetes.io/docs/concepts/scheduling-eviction/taint-and-toleration/)