Add window movement keybinds to hyprland

wm/hyprland.nix

@@ -95,6 +95,12 @@
         "$mod SHIFT, 3, movetoworkspace, 3"
         "$mod SHIFT, 4, movetoworkspace, 4"
         "$mod SHIFT, 5, movetoworkspace, 5"
+
+        # Window movement
+        "$mod SHIFT, LEFT,  movewindow, l"
+        "$mod SHIFT, RIGHT, movewindow, r"
+        "$mod SHIFT, UP,    movewindow, u"
+        "$mod SHIFT, DOWN,  movewindow, d"
       ];
 
       bindm = [