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

scenes/ui/start_screen/start_ui.gd

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+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")

scenes/ui/start_screen/start_ui.gd.uid

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+uid://ykbcl0j1wouh

scenes/ui/start_screen/start_ui.tscn

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+[gd_scene load_steps=3 format=3 uid="uid://da0ok71rkjpx8"]
+
+[ext_resource type="Script" uid="uid://ykbcl0j1wouh" path="res://scenes/ui/start_screen/start_ui.gd" id="1_mwcbl"]
+[ext_resource type="AudioStream" uid="uid://dcaul3y5u0mko" path="res://sounds/effects/ball-hits.wav" id="2_uxmhm"]
+
+[node name="start_ui" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("1_mwcbl")
+
+[node name="vbox" type="VBoxContainer" parent="."]
+layout_mode = 1
+anchors_preset = 9
+anchor_bottom = 1.0
+offset_left = 56.0
+offset_right = 312.0
+grow_vertical = 2
+alignment = 1
+
+[node name="play_bttn" type="Button" parent="vbox"]
+layout_mode = 2
+mouse_default_cursor_shape = 2
+text = "Play"
+
+[node name="multiplayer_bttn" type="Button" parent="vbox"]
+layout_mode = 2
+mouse_default_cursor_shape = 2
+text = "Multiplayer"
+
+[node name="button_sound" type="AudioStreamPlayer" parent="."]
+stream = ExtResource("2_uxmhm")
+
+[connection signal="mouse_entered" from="vbox/play_bttn" to="." method="_bttn_mouse_entered"]
+[connection signal="pressed" from="vbox/play_bttn" to="." method="_on_play_bttn_pressed"]
+[connection signal="mouse_entered" from="vbox/multiplayer_bttn" to="." method="_bttn_mouse_entered"]
+[connection signal="pressed" from="vbox/multiplayer_bttn" to="." method="_on_multiplayer_bttn_pressed"]