Add Doris Schoolhouse and clean pending homelab changes

pihole/serenity/README.md

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+# Serenity Pi-hole / Unbound / Keepalived Replica
+
+- **Repo stack path:** `/home/fizzlepoof/repos/truenas-stacks/pihole/serenity`
+- **Suggested live stack path:** `/boot/config/plugins/compose.manager/projects/pihole-ha`
+- **Node role:** Serenity backup / BACKUP1
+- **VIP target:** `10.5.1.53/24`
+- **LAN interface:** `br0`
+
+Bring-up:
+
+```bash
+cd /boot/config/plugins/compose.manager/projects/pihole-ha
+cp .env.example .env
+bash bin/prepare_serenity.sh --up
+```