Refactor OpenThePodBayDoors command implementation

I think it is more of the Community Toolkit way of programming

Author: mi9149

src/Avalonia.Samples/MVVM/CommandSample/ViewModels/CommunityToolkitCommandsViewModel.cs

@@ -27,11 +27,9 @@ public CommunityToolkitCommandsViewModel()
     /// </summary>
     /// <remarks>
     /// Note: We use the interface ICommand here because this makes things more flexible.
-    /// </remarks> 
-    public ICommand OpenThePodBayDoorsDirectCommand { get; }
-
-    // The method that will be executed when the command is invoked
-    private void OpenThePodBayDoors()
+    /// </remarks>
+    [RelayCommand]
+    private void OpenThePodBayDoorsDirect()
     {
         ConversationLog.Clear();
         AddToConvo("I'm sorry, Dave, I'm afraid I can't do that.");
@@ -104,4 +102,4 @@ private void AddToConvo(string content)
     {
         ConversationLog.Add(content);
     }
-}
+}