chore: ADR Multi-Node Kubernetes Clusters on init

[dgershman]

Description

ADR for zarf init multi-node.

Related Issue

N/A

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Other (security config, docs update, etc)

Checklist before merging

• [ ] Test, docs, adr added or updated as needed
• [ ] Contributor Guide Steps followed

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[dgershman]

based off some v1.0 discussion today, closing this in favor of maintaining a community init package and adding a docs page and linking back to this blog article and repo:

• https://radiusmethod.com/edge-ready-highly-available-kubernetes-with-zarf/
• https://github.com/radiusmethod/zarf-init-bigbang-k3s-ha