Page for environment variables

[viperML]

It would be nice to have a page for what environment variables to use. Right now, the nvidia page has some:

hyprland-wiki/pages/Nvidia/_index.md

Lines 26 to 36 in e32263d

	export LIBVA_DRIVER_NAME=nvidia
	export CLUTTER_BACKEND=wayland
	export XDG_SESSION_TYPE=wayland
	export QT_WAYLAND_DISABLE_WINDOWDECORATION=1
	export MOZ_ENABLE_WAYLAND=1
	export GBM_BACKEND=nvidia-drm
	export __GLX_VENDOR_LIBRARY_NAME=nvidia
	export WLR_NO_HARDWARE_CURSORS=1
	export WLR_BACKEND=vulkan
	export QT_QPA_PLATFORM=wayland
	export GDK_BACKEND=wayland

...but not all of these env variables are related to nvidia.

[NotAShelf]

Maybe some of those could be moved to the example wrapper section, as the NVIDIA article already links back to it. Potentially, a "final result" example (w/ both NVIDIA and other misc envvars in it) can be attached at the end of the relevant NVIDIA section.