Use "/static" root path to avoid security concerns

Author: jrrickerson

examples/.httpserver_simpletest.py.swp

@@ -21,7 +21,7 @@
 print("Connected to", ssid)
 
 pool = socketpool.SocketPool(wifi.radio)
-server = HTTPServer(pool, "")
+server = HTTPServer(pool, "/static")
 
 
 @server.route("/")