remove host name and CLI proxy which are not necessary by default

docker-compose.override.example.yml

@@ -3,24 +3,23 @@
 
 services:
   backend:
-    environment:
-      OPENPROJECT_CLI_PROXY: "http://localhost:${FE_PORT:-4200}"
-      OPENPROJECT_HOST__NAME: "${HOST:-localhost}:${PORT:-3000}"
+    # use these ports to be able to access the stack under http://localhost:3000
     ports:
       - "${PORT:-3000}:3000"
 
   frontend:
+    # use these ports to be able to access the stack under http://localhost:3000
     ports:
       - "${FE_PORT:-4200}:4200"
 
-  db:
-    ports:
-      - '5432:5432'
+  # db:
+  #   ports:
+  #     - '5432:5432'
 
-  db-test:
-    ports:
-      - '5433:5432'
+  # db-test:
+  #   ports:
+  #     - '5433:5432'
 
-  chrome:
-    ports:
-      - '5900:5900'
+  # chrome:
+  #   ports:
+  #     - '5900:5900'