Clarify the README for the external provisioner
Readme describes running cluster-build then cluster-sync, but that's
sort of silly; cluster-sync includes running cluster-build.
Clarify in the document that cluster-sync can do both, or you can use
cluster-deploy.
@@ -23,7 +23,14 @@ make cluster-build
## Installing Kubevirt artifacts on the cluster
+```bash
+make cluster-deploy
+```
+
+## Or do the build and deploy in one step
+
```bash
make cluster-sync
```
+```
