Doc for running TensorBoard

[jlewi]

We should have a component page that explains how to run TensorBoard.

We should explain how to connect to it

1. Using kubectl port-forward
2. IAP using GKE.

[jtfogarty]

/kind feature

[theofpa]

Tensorboard is an istio virtualservice:

$ kubectl describe virtualservice tensorboard -n kubeflow | grep Prefix
        Prefix:  /tensorboard/tensorboard/
$ kubectl get svc istio-ingressgateway -n istio-system
NAME                   TYPE           CLUSTER-IP     EXTERNAL-IP
istio-ingressgateway   LoadBalancer   <intenal-ip>   <external-ip>

so visiting http://external-ip/tensorboard/tensorboard/ works

More dashboards are available this way, we can create a list of them in a page for operations as part of #753

[swiftdiaries]

/assign @swiftdiaries

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