Refactor MainWindow to remove ViewModel initialization

Removed DataContext assignment in MainWindow constructor.

Author: shemaU2K

WPF/MainWindow.xaml.cs

@@ -1,4 +1,3 @@
-using Graph_Database_WPF.ViewModels;
 using System.Windows;
 
 namespace Graph_Database_WPF
@@ -8,7 +7,6 @@ public partial class MainWindow : Window
         public MainWindow()
         {
             InitializeComponent();
-            DataContext = new MainViewModel();
         }
     }
-}
+}