Merge pull request #674 from paulprogrammer/feat-nginx-http2

enable http2, because it's that easy

core/nginx/conf/nginx.conf

@@ -48,8 +48,8 @@ http {
 
       # Only enable HTTPS if TLS is enabled with no error
       {% if TLS and not TLS_ERROR %}
-      listen 443 ssl;
-      listen [::]:443 ssl;
+      listen 443 ssl http2;
+      listen [::]:443 ssl http2;
 
       include /etc/nginx/tls.conf;
       ssl_session_cache shared:SSLHTTP:50m;