docs: move f3s/k8s deployment details out to homelab skill

Remove all f3s/k3s/cluster-specific deployment content from README.md,
AGENTS.md, and ychat/DOCKER.md. The DB-backed build's deployment status,
live URL, image tag, PVC, Helm chart, and ArgoCD app details now live in
the private homelab skill's references/ychat.md sub-reference instead of
this public repo.

- README.md: drop the 'Deploying to the f3s k3s cluster' section and the
  'Deployed to f3s' table note; genericize the emptyDir log note.
- AGENTS.md: drop the explicit f3s skill name from the deployment section;
  keep only a generic out-of-scope pointer to the homelab skill.
- ychat/DOCKER.md: remove the 'still running live on the f3s k3s cluster'
  History mention, the 'Not yet deployed to f3s' block, and the entire
  'Deploying to the f3s k3s cluster' section.

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