Fix redirect to https with ipv6 enabled networks

docs/u_e-80_to_443.md

@@ -6,7 +6,8 @@ Open `data/conf/nginx/site.conf` and add a new site at the top of that file:
 
 ```
 server {
-	listen 80 default_server;
+  listen 80 default_server;
+  listen [::]:80 default_server;
 	include /etc/nginx/conf.d/server_name.active;
 	return 301 https://$host$request_uri;
 }