add librenms data volume to dispatcher container, move volume of rrdcacehd container to mount point /data

docker-compose.yml

@@ -28,7 +28,7 @@ services:
     environment:
       TZ: Europe/Paris
     volumes:
-      - /var/lib/docker/volumes/librenms/rrd_data:/data/db
+      - /var/lib/docker/volumes/librenms/rrd_data:/data
     command:
       - -w 1800
       - -z 1800
@@ -75,6 +75,8 @@ services:
       DB_USER: librenms
       DB_PASSWORD: librenmspass
       REDIS_HOST: redis
+    volumes:
+      - /var/lib/docker/volumes/librenms/librenms_data:/data
     restart: unless-stopped
 
   syslogng: