docs: simplified top-level example compose file

related to #518

docker-compose.yml

@@ -10,19 +10,7 @@ services:
       - "mc:/data"
     environment:
       EULA: "TRUE"
-      CONSOLE: "false"
-      ENABLE_RCON: "true"
-      RCON_PASSWORD: "testing"
-      RCON_PORT: 28016
     restart: always
-  rcon:
-    image: itzg/rcon
-    ports:
-      - "4326:4326"
-      - "4327:4327"
-    volumes:
-      - "rcon:/opt/rcon-web-admin/db"
 
 volumes:
-  mc:
-  rcon:
+  mc: {}