[ops] Add missing unfurl nginx route

production/nginx/server-common.conf

@@ -48,6 +48,9 @@ add_header Vary Cookie;
 # for exact / requests, redirect based on $lang
 # cache redirect for 5 minutes
 location = / {
+	if ($unfurlbot) {
+		proxy_pass $mempoolSpaceUnfurler;
+	}
 	if ($lang != '') {
 		return 302 $scheme://$host/$lang/;
 	}