RFC: docs: Update Platforms and Drivers page with more comprehensive information.

Jorge Natz requested to merge jorgenatz/mesa:master into master

This changes systems.html to include more drivers that had previously gone unmentioned. I was unsure if there was a reason why other drivers are left out, I apologize if I missed a reason for doing so.

The links for each driver were each to the most prominent/updated source of documentation I could find for each. I am certain there are people who know far more about this than I do, and please excuse any mistakes I may have made in my ignorance.

Thank you for any reply.

/cc @evelikov @eric

Edited by Jorge Natz

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