revproxy-03: www-prod: switch to new CT

Switch the www-prod domain to the new www-prod container

host_vars/revproxy-03.freifunk-stuttgart.de/revproxy

@@ -60,5 +60,5 @@ vhosts:
     redirect: "https://wiki.freifunk-stuttgart.net/technik:owe"
     type: redirect
   - domain: www-prod.freifunk-stuttgart.de
-    backend: "http://10.0.3.226/"
+    backend: "http://10.0.3.228/"
     type: proxy