Add suggestion for secure cyphers to nginx.conf (#26349)

dist/nginx.conf

@@ -36,7 +36,11 @@ server {
   server_name example.com;
 
   ssl_protocols TLSv1.2 TLSv1.3;
-  ssl_ciphers HIGH:!MEDIUM:!LOW:!aNULL:!NULL:!SHA;
+
+  # You can use https://ssl-config.mozilla.org/ to generate your cipher set.
+  # We recommend their "Intermediate" level.
+  ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305;
+
   ssl_prefer_server_ciphers on;
   ssl_session_cache shared:SSL:10m;
   ssl_session_tickets off;