* The Device Widget icon is updated, taken from
[qubes-desktop-linux-manager](QubesOS/qubes-desktop-linux-manager/tree/release4.2/)
* As the original PNG was deleted, all the ``how-to-use-*-devices`` have
been updated too (with a better markup)
* QubesOS/qubes-issues#4692 is closed so the corresponding paragraph has
been removed.
Note: cherry-picked from #1492
