puppet: remove dbx.zulip.com -- HW project

(imported from commit 6edc3f1af44969427b2a12bee1983367855b4b88)

puppet/zulip_internal/files/nginx/sites-available/loadbalancer

@@ -74,30 +74,6 @@ server {
     }
 }
 
-server {
-    listen staging.zulip.com:443;
-    server_name dbx.zulip.com;
-
-    ssl on;
-    ssl_certificate /etc/ssl/certs/wildcard-all.combined-chain.crt;
-    ssl_certificate_key /etc/ssl/private/wildcard-all.key;
-
-    location / {
-        proxy_pass https://dbx/;
-        include /etc/nginx/zulip-include/proxy;
-    }
-
-    location /sockjs {
-        proxy_pass https://dbx;
-        include /etc/nginx/zulip-include/location-sockjs;
-    }
-
-    location ~ /json/get_events|/json/events|/api/v1/events {
-        proxy_pass https://dbx;
-        include /etc/nginx/zulip-include/proxy_longpolling;
-    }
-}
-
 server {
     # This stanza also covers bare zulip.com
     listen www.zulip.com:443 default_server;