Add try_files directive robots.txt in performance.conf to ensure PHP apps handle routes correctly. Fixes #589

Author: jaydrogers

src/variations/fpm-nginx/etc/nginx/server-opts.d/performance.conf

@@ -8,6 +8,8 @@ location = /favicon.ico {
 location = /robots.txt {
     log_not_found off;
     access_log    off;
+    # Pass to PHP to ensure PHP apps can handle routes that end in these filetypes
+    try_files $uri /index.php?$query_string;
 }
 
 # assets, media