This adds a set of home Shepherd services which will start the required
services for a functional PipeWire setup.
* gnu/home/services/sound.scm (home-pipewire-shepherd-service,
home-wireplumber-shepherd-service, home-pipewire-shepherd-services,
home-pipewire-asoundrc, home-pipewire-xdg-configuration,
home-pipewire-pulseaudio-shepherd-service): New procedures.
(home-pipewire-service-type): New service type.
(home-pipewire-configuration): New struct.
(home-pipewire-disable-pulseaudio-auto-start): New variable.
* doc/guix.texi (Sound Home Services): Document it.
Change-Id: I99e0ae860de91d459c3c554ec5503bf35f785a2a
Signed-off-by: Oleg Pykhalov <go.wigust@gmail.com>