docs: #be notes on k8s deployment

README.md

@@ -36,3 +36,12 @@ Also, remember to
     This operation permits the ui to call the backend at `http://localhost:8080/oetzi_words/` instead of to the relative path.
 
 The webapp will be abailable at `http://localhost:1234`.
+
+## Deployment
+
+```bash
+# Please validate before deploying (note the cluster is 1.10.11 but 1.11.0 is the nearest one that works):
+kustomize build backend/k8s/overlays/ENV/ | kubeval --kubernetes-version 1.11.0
+# We're on an old version and there's no -k flag:
+kustomize build backend/k8s/overlays/ENV/ | kubectl apply -f -
+```