add a stronger link to ipv6vpn from the docker page

content/u/blog/how-to-enable-ipv6-in-docker/contents.lr

@@ -65,6 +65,12 @@ would look as follows:
 After adding this configuration, you will also need to restart the
 docker daemon. After that, your containers should be using IPv6.
 
+## What if you don't have an IPv6 network?
+
+Luckily, anyone can get an IPv6 network anywhere in the world
+nowadays. You can checkout [IPv6VPN](https://IPv6VPN.ch) for our
+Switzerland based offer.
+
 ## IPv6++
 
 If you want to learn more about IPv6 or how to secure your docker