build: modify dockerfile to serve demo instance as static webpage

docker-compose.yml

@@ -3,20 +3,4 @@ services:
   app:
     build: .
     ports:
-      - 3000:3000
-    environment:
-      - DATABASE_URL=postgresql://postgres:postgres@db:5432/postgres
-    depends_on:
-      - db
-    env_file:
-      - ./server/.env
-    command: /bin/sh -c "npx prisma db push && node index.js"
-  db:
-    image: postgres
-    environment:
-      - POSTGRES_PASSWORD=postgres
-    volumes:
-      - postgres-data:/var/lib/postgresql/data
-
-volumes:
-  postgres-data:
+      - 3000:80