pw-config: add page (#12800)

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Vítor Henrique <87824454+vitorhcl@users.noreply.github.com>

pages/linux/pw-config.md

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+# pw-config
+
+> List configuration paths and sections that will be used by the PipeWire server and clients.
+> More information: <https://docs.pipewire.org/page_man_pw-config_1.html>.
+
+- List all configuration files that will be used:
+
+`pw-config`
+
+- List all configuration files that will be used by the PipeWire PulseAudio server:
+
+`pw-config --name pipewire-pulse.conf`
+
+- List all configuration sections used by the PipeWire PulseAudio server:
+
+`pw-config --name pipewire-pulse.conf list`
+
+- List the `context.properties` fragments used by the JACK clients:
+
+`pw-config --name jack.conf list context.properties`
+
+- List the merged `context.properties` used by the JACK clients:
+
+`pw-config --name jack.conf merge context.properties`
+
+- List the merged `context.modules` used by the PipeWire server and [r]eformat:
+
+`pw-config --name pipewire.conf --recurse merge context.modules`
+
+- Display help:
+
+`pw-config --help`