remove unecessary stuff

package.json

@@ -67,11 +67,8 @@
   },
   "scripts": {
     "start": "concurrently -n server,client -c blue,green \"npm run start_server\" \"npm run start_client\"",
-    "start_single": "concurrently -n server,client -c blue,green \"npm run start_server_single\" \"npm run start_client_single\"",
     "start_server": "cd server && lake build && cross-env NODE_ENV=development nodemon -e mjs --exec \"node ./index.mjs\"",
     "start_client": "cross-env NODE_ENV=development webpack-dev-server --hot",
-    "start_server_single": "cd server && lake build && cross-env NODE_ENV=development LEAN4GAME_SINGLE_GAME=true nodemon -e mjs --exec \"node ./index.mjs\"",
-    "start_client_single": "cross-env NODE_ENV=development LEAN4GAME_SINGLE_GAME=true webpack-dev-server --hot",
     "build": "cross-env NODE_ENV=production webpack",
     "production": "cross-env NODE_ENV=production node server/index.mjs",
     "build_robo": "rm -rf ./Robo && git clone https://github.com/hhu-adam/Robo && docker build ./Robo --file ./Robo/Dockerfile --tag g/hhu-adam/robo && rm -rf ./Robo",