fix: simplify compose schema for coolify

docker-compose.yml

@@ -4,8 +4,6 @@ services:
   frontend:
     build:
       context: ./frontend
-      args:
-        - REACT_APP_API_URL=http://localhost:9501
     ports:
       - "9500:80"
     depends_on:
@@ -19,8 +17,6 @@ services:
     environment:
       - PORT=5000
       - MONGO_URI=mongodb://mongo:27017/limelite
-      # The rest are read from backend/.env or can be defined here
-      # The rest are read from backend/.env or can be defined here
     depends_on:
       - mongo
 
@@ -32,4 +28,4 @@ services:
       - mongo-data:/data/db
 
 volumes:
-  mongo-data:
+  mongo-data: {}