Remove Istio example (#163)

The Istio example doesn't work properly. It is better to route
users to Istio documentation so they can set it up properly.

We can revisit adding the example later if there is a working
example.

Co-authored-by: Praveen raj Mani <[email protected]>

README.md

@@ -51,16 +51,6 @@ kubectl apply -f https://raw.githubusercontent.com/minio/minio-operator/master/e
 
 Add an [external service](https://kubernetes.io/docs/concepts/services-networking/service/) in MinIOInstance definition to enable Service based access to the MinIOInstance pods. Refer [the example here](https://github.com/minio/minio-operator/blob/master/examples/minioinstance.yaml?raw=true) for details on how to setup service based access for MinIOInstance pods.
 
-### Advanced: Expose MinIO via Istio
-
-Istio >= 1.4 has support for headless Services, so instead of creating an explicit `Service` for the created MinIO instance, you can also directly target the headless Service that is created by the operator.
-
-For example, to expose the created headless Service `minio-hl-svc` on http://minio.example.com:
-
-```
-kubectl apply -f https://raw.githubusercontent.com/minio/minio-operator/master/examples/expose-via-istio.yaml
-```
-
 ### Environment variables
 
 These variables may be passed to operator Deployment in order to modify some of its parameters
@@ -76,3 +66,4 @@ These variables may be passed to operator Deployment in order to modify some of
 - [Use `mc` with MinIO Server](https://docs.min.io/docs/minio-client-quickstart-guide)
 - [Use `aws-cli` with MinIO Server](https://docs.min.io/docs/aws-cli-with-minio)
 - [The MinIO documentation website](https://docs.min.io)
+- Expose MinIO via Istio: Istio >= 1.4 has support for headless Services, so instead of creating an explicit `Service` for the created MinIO instance, you can also directly target the headless Service that is created by the operator. Use [Istio Ingress Gateway](https://istio.io/latest/docs/tasks/traffic-management/ingress/ingress-control/) to configure Istio to expose the MinIO service outside of the service mesh.