Adds the full step-by-step content for the Configure Auto-Heal Policies
stub: an nginx+redis scenario stack, adding a service-scoped policy,
and a live verification that breaks a container's healthcheck,
confirms the policy restarts it, and recovers it.
Adds the Tutorials tab to docs.json with 15 stub pages across three
groups (Fleet & nodes, Deploy & automate, Secure & integrate), and
writes the first full tutorial: enrolling a remote node via Pilot
Agent mode, verified end to end against a live control instance and
a second host running an existing Jellyfin Compose stack.
SaelixCode