Use "kinds" in topology definition file

(https://containerlab.dev/manual/topo-def-file/#kinds)

roles/dev_networks/files/lab01/vr-vmx.clab.yml

 name: vr-vmx
 
 topology:
+  kinds:
+    vr-vmx:
+      image: vrnetlab/vr-vmx:18.2R1.9
   nodes:
     vmx1:
       kind: vr-vmx
-      image: vrnetlab/vr-vmx:18.2R1.9
       startup-config: vmx1.cfg
     vmx2:
       kind: vr-vmx
-      image: vrnetlab/vr-vmx:18.2R1.9
       startup-config: vmx2.cfg
 
   links: