Short list of laptops/desktops that work well with Qubes OS

[adw]

@adw

In practice, this could mean:

• We add a link to the forum list in the doc index and on any appropriate pages (e.g., the HCL page).
• The existing hardware testing page becomes only about developer hardware testing activities and not at all about recommending models. Or we just eliminate this page entirely (if the devs don’t need it), and the existing URL becomes a redirect to the forum list.

@marmarek, do you need the hardware testing page?