Move Pi-hole backup node from Serenity to NOMAD

pihole/nomad/README.md

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+# NOMAD Pi-hole / Unbound / Keepalived Replica
+
+- **Repo stack path:** `/home/fizzlepoof/repos/truenas-stacks/pihole/nomad`
+- **Suggested live stack path:** `/mnt/hdd-1/docker/compose/pihole-nomad`
+- **Node role:** NOMAD backup / BACKUP1
+- **VIP target:** `10.5.1.53/24`
+- **LAN interface:** `enp5s0`
+- **NOMAD LAN IP:** `10.5.1.16`
+
+Bring-up:
+
+```bash
+cd /mnt/hdd-1/docker/compose/pihole-nomad
+cp .env.example .env
+bash bin/prepare_nomad.sh --up
+```