Replace Nuxt wiki with Outline deployment config

Strip the Nuxt 4 static site and replace with Docker Compose config
for self-hosted Outline wiki (Outline + PostgreSQL 16 + Redis 7).
Adds nginx reverse proxy with WebSocket support and CSS injection,
migration script for existing markdown articles, backup script,
and starter theme CSS.

scripts/outline-backup.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# =============================================================================
+# Outline Wiki Backup Script
+# Backs up PostgreSQL database and file storage from Docker containers.
+#
+# Usage:
+#   ./outline-backup.sh [backup_dir]
+#
+# Crontab (daily at 3 AM):
+#   0 3 * * * /path/to/outline-backup.sh /backups/outline >> /var/log/outline-backup.log 2>&1
+# =============================================================================
+
+BACKUP_DIR="${1:-/backups/outline}"
+DATE=$(date +%Y-%m-%d_%H%M)
+RETENTION_DAYS=14
+
+mkdir -p "$BACKUP_DIR"
+
+echo "=== Outline Backup — $DATE ==="
+
+# PostgreSQL dump
+echo "Backing up PostgreSQL..."
+docker exec outline-postgres pg_dump -U outline -Fc outline \
+  > "$BACKUP_DIR/outline-db-$DATE.dump"
+echo "  Database: outline-db-$DATE.dump"
+
+# File storage backup
+echo "Backing up file storage..."
+docker cp outline:/var/lib/outline/data - \
+  | gzip > "$BACKUP_DIR/outline-files-$DATE.tar.gz"
+echo "  Files: outline-files-$DATE.tar.gz"
+
+# Prune old backups
+echo "Pruning backups older than $RETENTION_DAYS days..."
+find "$BACKUP_DIR" -type f -mtime +$RETENTION_DAYS -delete
+
+echo "=== Backup complete ==="