add sway to website front page

[Joshua Branson]

Hey guix,

This patch adds sway wm to the front page of guix.gnu.org.  Sway does
seem to be pretty popular, and it works amazing well in guix.

What do ya'll think?

Thanks,

Joshua

P.S.  I haven't actually gotten around to getting haunt to build the
guix site locally.  I'll try to do that soon.  I think this patch is
simple enough, that it shouldn't break the site, but someone ought
to make sure of that.

0001-website-Add-sway-window-manager-to-front-page.patch
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