Merge pull request #51 from zachahn/patch-1

Respond with a 404 when the file doesn't exist

conf/app-nginx.conf.sigil

@@ -23,7 +23,7 @@ http {
     port_in_redirect off;
 
     location / {
-      try_files $uri $uri/ /index.html;
+      try_files $uri $uri/ =404;
     }
   }
 }