Remove old manifests and replace with jsonnet build

hack/example-service-monitoring/deploy

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-kubectl apply -f manifests/examples/example-app
+kubectl apply -f examples/example-app

hack/example-service-monitoring/teardown

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-kubectl delete -f manifests/examples/example-app
+kubectl delete -f examples/example-app