Update Helm Chart Documentation (#6725)

*Motivation*

The current helm chart is lacking documentation. This pull request aims to add documentation.

*Changes*

- Update Helm chart documentation
- Add a get-started section with Helm chart
- Remove the documentation of using yaml files.

README.md

@@ -19,58 +19,4 @@
 
 -->
 
-This directory contains the Helm Chart required
-to do a complete Pulsar deployment on Kubernetes.
-
-## Install Helm
-
-Before you start, you need to install helm.
-Following [helm documentation](https://docs.helm.sh/using_helm/#installing-helm) to install it.
-
-## Deploy Pulsar
-
-### Minikube
-
-#### Install Minikube
-
-[Install and configure minikube](https://github.com/kubernetes/minikube#installation) with
-a [VM driver](https://github.com/kubernetes/minikube#requirements), e.g. `kvm2` on Linux
-or `hyperkit` or `VirtualBox` on macOS.
-
-#### Create a K8S cluster on Minikube
-
-```
-minikube start --memory=8192 --cpus=4
-```
-
-#### Set kubectl to use Minikube.
-
-```
-kubectl config use-context minikube
-```
-
-After you created a K8S cluster on Minikube, you can access its dashboard via following command:
-
-```
-minikube dashboard
-```
-
-The command will automatically trigger open a webpage in your browser.
-
-#### Install Pulsar Chart
-
-Assume you already cloned pulsar repo in `PULSAR_HOME` directory.
-
-1. Go to Pulsar helm chart directory
-    ```shell
-    cd ${PULSAR_HOME}/deployment/kubernetes/helm
-    ```
-1. Install helm chart.
-    ```shell
-    helm install --values pulsar/values-mini.yaml ./pulsar
-    ```
-
-Once the helm chart is completed on installation, you can access the cluster via:
-
-- Web service url: `http://$(minikube ip):30001/`
-- Pulsar service url: `pulsar://$(minikube ip):30002/`
+Read [Deploying Pulsar on Kubernetes](http://pulsar.apache.org/docs/en/deploy-kubernetes/) for more details.