chore: removing nested CommandBar samples

src/samples/UWP/Uno.Themes.Samples.Shared/Content/Controls/CommandBarSamplePage.xaml.cs

@@ -1,4 +1,4 @@
-using Uno.Themes.Samples.Content.NestedSamples;
+using Uno.Themes.Samples.Content.NestedSamples;
 
 namespace Uno.Themes.Samples.Content.Controls;
 
@@ -10,13 +10,5 @@ public CommandBarSamplePage()
 	{
 		this.InitializeComponent();
 	}
-	private void ShowSampleInNestedFrame(object sender, RoutedEventArgs e)
-	{
-		Shell.GetForCurrentView()?.ShowNestedSample<CommandBarSample_NestedPage1>(clearStack: true);
-	}
-
-	private void ShowM3SampleInNestedFrame(object sender, RoutedEventArgs e)
-	{
-		Shell.GetForCurrentView()?.ShowNestedSample<M3MaterialCommandBarSample_NestedPage1>(clearStack: true);
-	}
+
 }