Enhance Immich deployment process by removing old single-container instances and updating service configurations

- Added logic to remove any existing single-container 'immich' instances to prevent conflicts with the new multi-container 'immich_server' stack.
- Updated `build-auto-installer-iso.sh` to utilize configuration files from the `configs/` directory for Nginx and systemd service, ensuring proper setup.
- Modified deployment scripts to ensure the removal of old containers and improved handling of Immich stack creation.
- Updated documentation to reflect changes in service configurations and critical build checklist items.

scripts/deploy-to-target.sh

@@ -401,6 +401,13 @@ if [ "$LIVE" = true ]; then
     sshpass -p "$ARCHIPELAGO_PASSWORD" ssh $SSH_OPTS "$TARGET_HOST" "
       DOCKER=podman
       command -v podman >/dev/null 2>&1 || DOCKER=docker
+      # Remove old single-container 'immich' if present (wrong port mapping, conflicts with immich_server)
+      if sudo \$DOCKER ps -a --format '{{.Names}}' 2>/dev/null | grep -qx immich; then
+        echo '   Removing old immich container (use immich_server)...'
+        sudo \$DOCKER stop immich 2>/dev/null
+        sudo \$DOCKER rm -f immich 2>/dev/null
+        sudo \$DOCKER start immich_server 2>/dev/null || true
+      fi
       if ! sudo \$DOCKER ps --format '{{.Names}}' 2>/dev/null | grep -q immich_server; then
         echo '   Creating Immich stack...'
         sudo mkdir -p /var/lib/archipelago/immich /var/lib/archipelago/immich-db