Update url for deploying Prow
## Creating the cluster
1. Create the GKE cluster, the role bindings and the GitHub secrets. You might
- need to update [Makefile](./prow/Makefile). For details, see <https://github.com/kubernetes/test-infra/blob/master/prow/getting_started.md>.
+ need to update [Makefile](./prow/Makefile). For details, see <https://github.com/kubernetes/test-infra/blob/master/prow/getting_started_deploy.md>.
1. Ensure the GCP projects listed in [resources.yaml](./prow/boskos/resources.yaml)
are created.
