refactor: massive refactor input elements, step 1/3

src/Shared/HandyControlDemo_Shared/ViewModel/Controls/SearchBarDemoViewModel.cs

@@ -1,16 +0,0 @@
-using GalaSoft.MvvmLight;
-using GalaSoft.MvvmLight.Command;
-using HandyControl.Controls;
-
-namespace HandyControlDemo.ViewModel
-{
-    public class SearchBarDemoViewModel : ViewModelBase
-    {
-        public RelayCommand<string> SearchCmd => new(Search);
-
-        private void Search(string key)
-        {
-            Growl.Info(key);
-        }
-    }
-}