Merge pull request #182 from nightah/ipv6-docs

Update IPv6 related docs

docs/firststeps-disable_ipv6.md

@@ -1,4 +1,4 @@
-This is **NOT** recommended!
+This is **ONLY** recommended if you do not have an IPv6 enabled network on your host!
 
 If IPv6 MUST be disabled to fit a network, open `docker-compose.yml`, search for `enable_ipv6`...
 

docs/i_u_m_install.md

@@ -63,6 +63,13 @@ networks:
     ...
 ```
 
+**4\.2\.** Users without an IPv6 enabled network on their host system:
+
+**Enable IPv6. Finally.**
+
+If you do not have an IPv6 enabled network on your host and you don't care for a better internet (thehe), it is recommended to [disable IPv6](https://mailcow.github.io/mailcow-dockerized-docs/firststeps-disable_ipv6/) for the mailcow network to prevent unforeseen issues.
+
+
 **5\.** Pull the images and run the composer file. The parameter `-d` will start mailcow: dockerized detached:
 ```
 docker-compose pull