pactl: add page (#2978)

pages/common/pactl.md

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+# pactl
+
+> Control a running PulseAudio sound server.
+
+- List all sinks (or other types - sinks are outputs and sink-inputs are active audio streams):
+
+`pactl list {{sinks}} short`
+
+- Change the default sink (output) to 1 (the number can be retrieved via the `list` subcommand):
+
+`pactl set-default-sink {{1}}`
+
+- Move sink-input 627 to sink 1:
+
+`pactl move-sink-input {{627}} {{1}}`
+
+- Set the volume of sink 1 to 75%:
+
+`pactl set-sink-volume {{1}} {{0.75}}`
+
+- Toggle mute on the default sink (using the special name `@DEFAULT_SINK@`):
+
+`pactl set-sink-mute {{@DEFAULT_SINK@}} toggle`