default router

[qrkourier]

resolves #108

[qrkourier]

I'm planning to return to this effort in the near future.

[qrkourier]

This is an important piece of the compacted K8s deployment story that supports self-hosted zrok and bring-your-own-k8s user stories.

[qrkourier]

My plan for this is to administratively create a router named like "default-router" when the controller is deployed. The router enrollment token and any required config inputs should be stored in a k8s secret or configmap with a predictable name so that it's practical to orchestrate deploying a router chart to source that token and config as template inputs.

[qrkourier]

This won't unblock anything, and it better accomplished by an operator.