Remove unnecessary comments and clean up Dockerfile structure for clarity

Dockerfile

@@ -69,11 +69,7 @@ if (process.env.NODE_ENV === 'production') {
 }
 
 module.exports = { server };
-root@DietPi:~/mern-ludo/backend# ^C
+
-root@DietPi:~/mern-ludo/backend# cd .
-root@DietPi:~/mern-ludo/backend# cd ..
-root@DietPi:~/mern-ludo# nano Dockerfile
-root@DietPi:~/mern-ludo# cat Dockerfile
 # Node 20 for Pi 5 (ARM64)
 FROM node:20-bullseye-slim
 

docker-compose.yml

@@ -9,7 +9,8 @@ services:
       - ludo-net
     volumes:
       - ludo-mongo-data:/data/db
-      - ./mongo-keyfile:/etc/mongo-keyfile:ro
+      - /opt/ludo-secrets/mongo-keyfile:/etc/mongo-keyfile:ro
+      # - ./mongo-keyfile:/etc/mongo-keyfile:ro
       # - ./mongo-init.js:/docker-entrypoint-initdb.d/mongo-init.js:ro
     command:
       - bash