Optimize backgound - move it to root node

ui/MainMenu.tscn

@@ -1,7 +1,6 @@
-[gd_scene load_steps=3 format=3 uid="uid://m8lf3eh3al5j"]
+[gd_scene load_steps=2 format=3 uid="uid://m8lf3eh3al5j"]
 
 [ext_resource type="Script" uid="uid://ctu58xq7btp1n" path="res://scripts/MainMenu.gd" id="1_b00nv"]
-[ext_resource type="Texture2D" uid="uid://c8y6tlvcgh2gn" path="res://resources/textures/beanstalk-dark.webp" id="2_rn8js"]
 
 [node name="MainMenu" type="Control"]
 layout_mode = 3
@@ -12,16 +11,6 @@ grow_horizontal = 2
 grow_vertical = 2
 script = ExtResource("1_b00nv")
 
-[node name="Background" type="TextureRect" parent="."]
-layout_mode = 1
-anchors_preset = 15
-anchor_right = 1.0
-anchor_bottom = 1.0
-grow_horizontal = 2
-grow_vertical = 2
-texture = ExtResource("2_rn8js")
-stretch_mode = 1
-
 [node name="MenuContainer" type="VBoxContainer" parent="."]
 layout_mode = 1
 anchors_preset = 8