Update getting started link

Previously there was suggested 5 minutes video from GDQuest youtube channel. 
They've prepared new video that is about GODOT 4, which is more relevant for godot 4 tutorial.

getting_started/introduction/godot_design_philosophy.rst

@@ -17,7 +17,7 @@ your project, you need to try it out for yourself and
 understand its design and limitations.
 
 Please watch
-`Godot explained in 5 minutes <https://www.youtube.com/watch?v=KjX5llYZ5eQ>`_
+`Godot explained in 7 minutes <https://www.youtube.com/watch?v=yS9cuu5o5Ug>`_
 if you're looking for an overview of the engine's features.
 
 Object-oriented design and composition