removed unnecessary code

lib/home.dart

@@ -23,20 +23,6 @@ class _MyHomePageState extends State<MyHomePage> {
       _selectedIndex = index;
     });
   }
-
-  int _counter = 0;
-
-  void _incrementCounter() {
-    setState(() {
-      // This call to setState tells the Flutter framework that something has
-      // changed in this State, which causes it to rerun the build method below
-      // so that the display can reflect the updated values. If we changed
-      // _counter without calling setState(), then the build method would not be
-      // called again, and so nothing would appear to happen.
-      _counter++;
-    });
-  }
-
   void setLogin(bool value) {
     setState(() {
       login = value;