Alyx Ferrari

@hykilpikonna Cool! You had me at pride flags :P I'll try it out!

This PR should have a section on SSDT-BRG0, but I'm pretty underqualified for that as I hear there's a bit of nuance to it on different platforms. Help is much...

@vandroiy2013 If you have time at some point, could you take a screenshot of IOReg with GFX0 (or whatever your GPU's name is) selected, and another screenshot of the pci-bridge...

Tried to make an SSDT-BRG0 guide. If there's any issues with it, leave a review of course.

Also edited some things in `ktext.md` unrelated to Alder Lake.

Need to figure out how to add the Alder Lake guide to the sidebar at some point, all I did was add the markdown file.

I'm sure there's still some things that need tweaking, but it's at least in theory finished at this point. Opened up dortania/Getting-Started-With-ACPI#73 as well.

@vandroiy2013 Do you happen to know the `PciRoot` path for the iGPU on Alder Lake? Couldn't find it in your Z690 reference config. I thought it would be a good...

Converted back to a draft since dortania/Getting-Started-With-ACPI#73 should include a section on SSDT-BRG0. [Message link](https://github.com/dortania/Getting-Started-With-ACPI/pull/73#issuecomment-1036404360)

Added an SSDT-BRG0 guide to dortania/Getting-Started-With-ACPI#73. This PR should be ready for review again.