Added keyboard control to main menu. Reworked logic

menu/pause_menu.gd

@@ -1,9 +1,25 @@
+class_name PauseMenu
+
 extends Node
 
 signal continue_game
 signal show_main_menu
 
 
+func _ready() -> void:
+    _init_focus()
+    _setup_neighbors()
+
+
+func _init_focus() -> void:
+    $%ContinueButton.grab_focus()
+
+
+func _setup_neighbors() -> void:
+   $%ContinueButton.focus_neighbor_top = $%MainMenuButton.get_path()
+   $%MainMenuButton.focus_neighbor_bottom = $%ContinueButton.get_path()
+
+
 func _on_continue_button_pressed() -> void:
     continue_game.emit()