Add audio settings management and integrate into UI; refactor input settings handling

autoloads/config_file_handler.gd

@@ -6,8 +6,6 @@ const SETTINGS_PATH := "user://settings.ini"
 
 func _ready() -> void:
 	if !FileAccess.file_exists(SETTINGS_PATH):
-		settings_config.set_value("keybinding", "left", "A")
-
 		settings_config.save(SETTINGS_PATH)
 	else:
 		settings_config.load(SETTINGS_PATH)