Disabled PM2 logging to $HOME/.pm2

backend/pm2.config.js

@@ -2,6 +2,8 @@ module.exports = {
     apps : [{
       name   : "YoutubeDL-Material",
       script : "./app.js",
-      watch  : "placeholder"
+      watch  : "placeholder",
+      out_file: "/dev/null",
+      error_file: "/dev/null"
     }]
 }