Replace S3 storage with Docker-mounted filesystem

- Add Docker and Compose deployment with persistent HTML and Postgres volumes
- Remove AWS storage configuration and dependency
- Document local Docker setup and filesystem storage

package.json

@@ -22,7 +22,6 @@
     "node": ">=20"
   },
   "dependencies": {
-    "@aws-sdk/client-s3": "^3.835.0",
     "commander": "^14.0.0",
     "express": "^5.1.0",
     "jose": "^6.2.3",