🔑 Update NGINX SSL parameters (#127)

Author: frenck

bookstack/rootfs/etc/nginx/includes/ssl_params.conf

@@ -1,7 +1,6 @@
-ssl_protocols TLSv1.3 TLSv1.2;
-ssl_prefer_server_ciphers on;
-ssl_ciphers ECDHE-RSA-AES256-GCM-SHA512:DHE-RSA-AES256-GCM-SHA512:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:DHE-RSA-AES256-SHA;
-ssl_ecdh_curve secp384r1;
+ssl_protocols TLSv1.2 TLSv1.3;
+ssl_prefer_server_ciphers off;
+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_session_timeout  10m;
 ssl_session_cache shared:SSL:10m;
 ssl_session_tickets off;