Add a godot intro slash screen

[rafaelcastrocouto]

https://github.com/InsanityGamer/GodotSplashScreen

[WhalesState]

We can Just write Made with Godot in the game page or inside the current game splash screen, no more files or icons will be needed since Godot's Icon isn't looking good and they didn't change it in godot 4 to make it possible to tell that this was made in 3 or 4.