"guix deploy" is in git master

[Christopher Lemmer Webber]

Huge congratulations to Jakob in that "guix deploy" has just hit git
master!  There's a new section of the manual, "8.15 Invoking ‘guix
deploy’"; see that for details.

Please play with it and let us know what your experiences are!

MANY THANKS and HUGE CONGRATS to Jakob for getting this key piece in of
their GSoC project already this summer!  More cool stuff is ahead, I
understand :)

Now who's going to be the first brave soul to use this for server
deployment? ;)
 - Chris