Add Steam Deck to homepage and hardware pages

This MR adds the Steam Deck to the homepage and to the hardware pages.

I took the image from the Steam Deck press page and resized it so it is not so large (there's two sizes, one smaller for the homepage and one bigger for the hardware page).

The copy can be tweaked of course, I tried to be engaging but I'm no copywriter.

I also tried to add a nice gradient. Please let me know how it fits styling-wise and I will tweak.

homepage

homepage between 768px and 1024px (smaller desktops)

hardware page