Provide conceptual overview of personas and KEDA

[tomkerkhove]

Provide conceptual overview of personas and KEDA so that it becomes clear that:

1. KEDA is installed once, typically by cluster operator
2. Cluster operator can install ClusterTriggerAuthentication
3. SO/SJ & Trigger Authentication are scoped to a namespace
4. KEDA does not scale clusters

This should be explained visually similar to https://gateway-api.sigs.k8s.io/

[stale]

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