docs: add istio section to expose-a-service

[jeffmccune]

This patch adds Istio to the Expose a Service documentation and introduces new concepts. The Kubernetes build plan schema, the namespaces component, and an example of how to safely re-use Helm values from the root to multiple leaf components.

fix: istio cni not ready on k3d

The istio-k3d component embedded into holos fixes the cni pod not becoming ready with our k3d local cluster guide. The pod log error this fixes is:

configuration requires updates, (re)writing CNI config file at "": no networks found in /host/etc/cni/net.d
Istio CNI is configured as chained plugin, but cannot find existing CNI network config: no networks found in /host/etc/cni/net.d
Waiting for CNI network config file to be written in /host/etc/cni/net.d...

docs: clarify how to reset the local cluster

This is something we do all the time while developing and documenting, so make it easy and fast to reset the cluster to a known good state.

Issue: #234

[cloudflare-workers-and-pages[bot]]

Deploying holos with    Cloudflare Pages

Latest commit:	6f39cc6
Status:	⚡️  Build in progress...

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