docs: Add Docker deployment documentation with data folder

- Update docker-compose to use ./data folder for SQLite database
- Add Docker section to README with setup instructions

docker-compose.yml

@@ -6,7 +6,7 @@ services:
     ports:
       - "3000:3000"
     volumes:
-      - ./prisma:/app/prisma
+      - ./data:/app/data
     environment:
-      - DATABASE_URL=file:./dev.db
+      - DATABASE_URL=file:./data/dev.db
     restart: unless-stopped