Readme update (#720)

### Description
Readme update

### Issues Resolved
Part of
#709
and
#674

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and
signing off your commits, please check
[here](https://github.com/opensearch-project/OpenSearch/blob/main/CONTRIBUTING.md#developer-certificate-of-origin).

Signed-off-by: Prudhvi Godithi <[email protected]>

README.md

@@ -1,4 +1,4 @@
-![build](https://github.com/opensearch-project/opensearch-k8s-operator/actions/workflows/docker-build.yaml/badge.svg) ![test](https://github.com/opensearch-project/opensearch-k8s-operator/actions/workflows/testing.yaml/badge.svg) ![release](https://img.shields.io/github/v/release/opster/opensearch-k8s-operator) [![Golang Lint](https://github.com/Opster/opensearch-k8s-operator/actions/workflows/linting.yaml/badge.svg)](https://github.com/Opster/opensearch-k8s-operator/actions/workflows/linting.yaml) [![Artifact Hub](https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/opensearch-operator)](https://artifacthub.io/packages/search?repo=opensearch-operator)
+![build](https://github.com/opensearch-project/opensearch-k8s-operator/actions/workflows/docker-build.yaml/badge.svg) ![test](https://github.com/opensearch-project/opensearch-k8s-operator/actions/workflows/testing.yaml/badge.svg) ![release](https://img.shields.io/github/v/release/opensearch-project/opensearch-k8s-operator) [![Golang Lint](https://github.com/opensearch-project/opensearch-k8s-operator/actions/workflows/linting.yaml/badge.svg)](https://github.com/opensearch-project/opensearch-k8s-operator/actions/workflows/linting.yaml) [![Artifact Hub](https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/opensearch-operator)](https://artifacthub.io/packages/search?repo=opensearch-operator)
 
 # OpenSearch Kubernetes Operator