Update ssl-ciphers.conf

Removing support (by default) for all the unsecure protocols. This should be the default and if needed additional support can be configured. As this is a security feature it should be aligned with a moderate policy. This is updated using the latest recomendation as found on https://ssl-config.mozilla.org/#server=nginx&version=1.17.7&config=intermediate&openssl=1.1.1d&guideline=5.6

docker/rootfs/etc/nginx/conf.d/include/ssl-ciphers.conf

@@ -3,7 +3,5 @@ ssl_session_cache shared:SSL:50m;
 
 # intermediate configuration. tweak to your needs.
 ssl_protocols TLSv1.2 TLSv1.3;
-ssl_ciphers 'EECDH+AESGCM:AES256+EECDH:AES256+EDH:EDH+AESGCM:ECDHE-RSA-AES256-GCM-SHA512:DHE-RSA-AES256-GCM-SHA512:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-
-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AE
-S128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES';
-ssl_prefer_server_ciphers on;
+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;