wpctl: add page (#10574)

* wpctl: add page


---------

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/linux/wpctl.md

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+# wpctl
+
+> Manage WirePlumber, a session and policy manager for PipeWire.
+> Note: you can use the special name `@DEFAULT_SINK@` in place of `id` to operate on the default sink.
+> More information: <https://pipewire.pages.freedesktop.org/wireplumber/>.
+
+- List all objects managed by WirePlumber:
+
+`wpctl status`
+
+- Print all properties of an object:
+
+`wpctl inspect {{id}}`
+
+- Set an object to be the default in its group:
+
+`wpctl set-default {{id}}`
+
+- Get the volume of a sink:
+
+`wpctl get-volume {{id}}`
+
+- Set the volume of a sink to `n` percent:
+
+`wpctl set-volume {{id}} {{n}}%`
+
+- Increase/Decrease the volume of a sink by `n` percent:
+
+`wpctl set-volume {{id}} {{n}}%{{+|-}}`
+
+- Mute/Unmute a sink (1 is mute, 0 is unmute):
+
+`wpctl set-mute {{id}} {{1|0|toggle}}`