Modified docker definitions to use internal caddy_net

Exposing ports on docker-compose bypasses UFW definitions, which is a
high risk, so we use internal networks only to connect between
containers

templates/caddy/simple/docker-compose.yml

@@ -16,4 +16,4 @@ services:
 
 networks:
   caddy_net: # Crete VPN internal - Need to bind running containers to this network as well
-    driver: bridge
+    external: true # caddy_net must be created before spinning up containers