On Downloads page add options for K8s operator installation

[chirag-yb]

Local Install >> K8s >> Add two more options

• Yugabyte DB Operator https://docs.yugabyte.com/latest/deploy/kubernetes/single-zone/oss/yugabyte-operator/

• Operator hub for Openshift - https://docs.yugabyte.com/latest/deploy/kubernetes/single-zone/oss/operator-hub/