3.3.0 fix

distributed-print/install/nginx/teachcloud.conf

@@ -3,7 +3,7 @@ server {
         charset utf-8;
  
         location ^~ / {
-                root  ../../teachcloud/web;
+                root  ../../teachcloud/web/print/;
                 try_files $uri $uri/ /index.html;
 		}