modernized nginx reverse proxy example

docs/firststeps-ip_bindings.md

@@ -1,4 +1,4 @@
-   !!! warning
+!!! warning
     Changing the binding does not affect source NAT. See [SNAT](https://mailcow.github.io/mailcow-dockerized-docs/firststeps-snat/) for required steps.
 
 ## IPv4 binding

docs/firststeps-rp.md

@@ -93,7 +93,7 @@ Let's Encrypt will follow our rewrite, certificate requests will work fine.
 
 **Take care of highlighted lines.**
 
-``` hl_lines="4 10 12 13 18 32"
+``` hl_lines="4 10 12 13 23 37"
 server {
   listen 80 default_server;
   listen [::]:80 default_server;
@@ -101,14 +101,19 @@ server {
   return 301 https://$host$request_uri;
 }
 server {
-  listen 443 ssl;
-  listen [::]:443 ssl;
+  listen 443 ssl http2;
+  listen [::]:443 ssl http2;
   server_name CHANGE_TO_MAILCOW_HOSTNAME autodiscover.* autoconfig.*;
 
   ssl_certificate MAILCOW_PATH/data/assets/ssl/cert.pem;
   ssl_certificate_key MAILCOW_PATH/data/assets/ssl/key.pem;
-  ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
-  ssl_ciphers HIGH:!aNULL:!MD5;
+  ssl_session_timeout 1d;
+  ssl_session_cache shared:SSL:50m;
+  ssl_session_tickets off;
+
+  ssl_protocols TLSv1.2 TLSv1.3;
+  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;
+  ssl_prefer_server_ciphers off;
 
   location /Microsoft-Server-ActiveSync {
     proxy_pass http://127.0.0.1:8080/Microsoft-Server-ActiveSync;