Align patterns better around what UI components are. Move script related controllers to scripts folder

scenes/ui/start_screen/start_ui.gd

@@ -0,0 +1,14 @@
+class_name StartMenuControls extends Control
+
+
+@onready var button_sound: AudioStreamPlayer = $button_sound
+
+
+func _bttn_mouse_entered() -> void:
+	button_sound.play(0.0)
+
+func _on_play_bttn_pressed() -> void:
+	Globals.game_state.set_game_scene("res://scenes/game.tscn")
+
+func _on_multiplayer_bttn_pressed() -> void:
+	Globals.game_state.set_game_scene("res://scenes/screens/lobby_screen/lobby.tscn")