:wrench: Customize slide input keys

To experiment the new customization feature.

godot/run/root.tscn

@@ -93,6 +93,10 @@ scope_trans = 10
 
 [node name="Show" parent="Board" instance=ExtResource("2_cih7e")]
 hide_slides = true
+action_finish_slide = "ui_right"
+action_skip_slide = "ui_down"
+action_previous_slide = "ui_up"
+action_home_slide = "ui_left"
 
 [node name="World" parent="Board/Show" instance=ExtResource("3_s3lgd")]
 scale = Vector2(10, 10)