Update Documentation: Redirect Helm Chart Installation Links to Kubeflow Repository

[vara-bonthu]

Description:

With the recent migration of our Spark Operator repository from the GoogleCloudPlatform organization to the Kubeflow organization, it is essential to update our documentation to reflect the changes in the location of our Helm Charts. This update ensures users are directed to the correct repository for installations and updates.

The documentation currently directs users to add the Helm repository from the old location:

helm repo add spark-operator https://googlecloudplatform.github.io/spark-on-k8s-operator

Required Change:
We need to update all occurrences of the Helm install links in the documentation to point to the new repository location under the Kubeflow organization:

helm repo add spark-operator https://kubeflow.github.io/spark-operator

Scope of the Update:

The change needs to be reflected across multiple documentation pages wherever the Helm Chart installation instructions are mentioned. Review all documentation files for any references to the old repository, ensuring consistency and accuracy across the board.

Similar issues : #1926

[vara-bonthu]

Closing this issue as it has been resolved with the merge of PR #1937