Remove auth providers configuration

This is no longer supported by Gitpod and can be achieved by using the authentication
screen on first-run

Makefile

@@ -23,10 +23,6 @@ uninstall: ## Uninstall Gitpod
 	@echo "Starting uninstall process..."
 	@$(call DOCKER_RUN_CMD, --uninstall)
 
-auth: ## Install OAuth providers
-	@echo "Installing auth providers..."
-	@$(call DOCKER_RUN_CMD, --auth)
-
 help:  ## Display this help
 	@awk 'BEGIN {FS = ":.*##"; printf "\nUsage:\n  make \033[36m<target>\033[0m\n"} /^[a-zA-Z0-9_-]+:.*?##/ { printf "  \033[36m%-15s\033[0m %s\n", $$1, $$2 } /^##@/ { printf "\n\033[1m%s\033[0m\n", substr($$0, 5) } ' $(MAKEFILE_LIST)
 

README.md

@@ -117,18 +117,16 @@ It should display the Gitpod login page similar to the next image.
 
 ----
 
-## Update Gitpod auth providers
+## Delete Gitpod from your cluster
 
-Please check the [OAuth providers integration documentation](https://www.gitpod.io/docs/self-hosted/0.5.0/install/oauth) expected format.
+Remove Gitpod from your cluster running:
 
-We provide an [example here](./auth-providers-patch.yaml). Fill it with your OAuth providers data.
-
-```console
-make auth
+```shell
+kubectl get configmaps gitpod-app \
+  -o jsonpath='{.data.app\.yaml}' | \
+  kubectl delete -f -
 ```
 
-> We are aware of the limitation of this approach, and we are working to improve the helm chart to avoid this step.
-
 ## Destroy the cluster and GCP resources
 
 Remove the GCP cluster running: