Point to "Confluent for Kubernetes Scenario Examples" repo

I think a lot of folks come here to look for examples, and there is a kubernetes folder that shows a demo. That's great, but I think there should also be a link to https://github.com/confluentinc/confluent-kubernetes-examples which is a pretty comprehensive demo repo for CfK

Review the documentation in the kubernetes folder, starting with the existing demo reference. Add a link to the Confluent for Kubernetes Scenario Examples repository, then verify that readers can find the comprehensive CfK examples from this project.

Written by the indexing model from the issue text.