Official website docs could describe full CLI commands args and options

[jo-chemla]

Again, thanks a lot for this great building block. I've been trying multiple gltf-transform cli commands, and had to refer to the -h help command a few times to understand what arguments and options can be passed to each command, their default values etc - for optimize, draco, etc.

The help returned is really useful as is. It might help newcomers to add the dumps of these help to the docs CLI website itself, maybe in a page labelled commands options, as a sibling of Quickstart and Configuration.