sound/index.md: Convert to a pipewire stub article (#448)

The current page is mostly about transitioning from Pulse to Pipewire,
and we are Pipewire by default now, so convert the Sound page into a stub.

Resolves #431

docs/user/software/sound/index.md

@@ -5,35 +5,4 @@ summary: Configuration of sound systems on Solus
 
 # Sound
 
-Solus comes with PulseAudio configured by default.
-It is possible to switch to PipeWire manually using the instructions below.
-
-## PipeWire
-
-PipeWire is a multimedia framework aimed to replace PulseAudio.
-Installing it can be done by installing PipeWire and WirePlumber:
-
-```console
-sudo eopkg it pipewire wireplumber
-```
-
-Subsequently enable the user services, and disable PulseAudio (without sudo!):
-
-```console
-systemctl --user enable --now pipewire.socket pipewire-pulse.socket wireplumber.service
-systemctl --user mask [email protected]
-```
-
-You should now be using PipeWire. This can be verified using:
-
-```
-pactl info | grep '^Server Name'
-```
-
-Which should show something like the following:
-
-```
-Server Name: PulseAudio (on PipeWire 0.3.71)
-```
-
-Try logging out and in again if your system has not switched yet.
+Solus comes with Pipewire configured by default.