Update Compiling for Windows following Direct3D 12 being enabled by default

The recommendation is now to leave `d3d12` to its default `yes` value,
which means installing Direct3D 12 dependencies is considered required
by default.

You can still skip the dependencies by compiling with `d3d12=no`, which matches
the behavior of self-compiled builds prior to Godot 4.6.

This also removes an outdated FAQ question, since a lot of time has passed
since that question was written (Godot only had Vulkan and OpenGL support
back then).

about/faq.rst

@@ -309,21 +309,6 @@ See :ref:`doc_data_paths` for more information.
 If *true* portable operation is desired (e.g. for use on a USB stick),
 follow the steps in :ref:`doc_data_paths_self_contained_mode`.
 
-Why does Godot prioritize Vulkan and OpenGL over Direct3D?
-----------------------------------------------------------
-
-Godot aims for cross-platform compatibility and open standards first and
-foremost. OpenGL and Vulkan are the technologies that are both open and
-available on (nearly) all platforms. Thanks to this design decision, a project
-developed with Godot on Windows will run out of the box on Linux, macOS, and
-more.
-
-While Vulkan and OpenGL remain our primary focus for their open standard and
-cross-platform benefits, Godot 4.3 introduced experimental support for Direct3D 12.
-This addition aims to enhance performance and compatibility on platforms where
-Direct3D 12 is prevalent, such as Windows and Xbox. However, Vulkan and OpenGL
-will continue as the default rendering drivers on all platforms, including Windows.
-
 Why does Godot aim to keep its core feature set small?
 ------------------------------------------------------