Change Heimdall config volume path to relative

heimdall/docker-compose.yml

@@ -9,7 +9,7 @@ services:
       - TZ=Europe/Amsterdam
       - ALLOW_INTERNAL_REQUESTS=false #optional
     volumes:
-      - /mnt/synoNFS/heimdall/config:/config
+      - ./config:/config
     ports:
       - 50:80
       - 5443:443