kandra: We do not serve staging from staging.zulip.com:80.

It is not configured in the ALB's rules, nor does the ALB ever forward
to port 80.

puppet/kandra/files/nginx/sites-available/zulip-staging

@@ -1,10 +1,3 @@
-server {
-    listen 80;
-    listen [::]:80;
-    server_name staging.zulip.com;
-    return 301 https://$server_name$request_uri;
-}
-
 include /etc/nginx/zulip-include/trusted-proto;
 include /etc/nginx/zulip-include/s3-cache;
 include /etc/nginx/zulip-include/upstreams;