Move pages under tldr, lint run.sh, update docs

tldr/linux/pw-loopback

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pw-loopback
+
+> Create loopback devices in PipeWire.
+> More information: <https://gitlab.freedesktop.org/pipewire/pipewire/-/wikis/Virtual-Devices>.
+
+- Create a loopback device with the default loopback behavior:
+
+`pw-loopback`
+
+- Create a loopback device that automatically connects to the speakers:
+
+`pw-loopback -m '{{[FL FR]}}' --capture-props='{{media.class=Audio/Sink}}'`
+
+- Create a loopback device that automatically connects to the microphone:
+
+`pw-loopback -m '{{[FL FR]}}' --playback-props='{{media.class=Audio/Source}}'`
+
+- Create a dummy loopback device that doesn't automatically connect to anything:
+
+`pw-loopback -m '{{[FL FR]}}' --capture-props='{{media.class=Audio/Sink}}' --playback-props='{{media.class=Audio/Source}}'`
+
+- Create a loopback device that automatically connects to the speakers and swaps the left and right channels between the sink and source:
+
+`pw-loopback --capture-props='{{media.class=Audio/Sink audio.position=[FL FR]}}' --playback-props='{{audio.position=[FR FL]}}'`
+
+- Create a loopback device that automatically connects to the microphone and swaps the left and right channels between the sink and source:
+
+`pw-loopback --capture-props='{{audio.position=[FR FL]}}' --playback-props='{{media.class=Audio/Source audio.position=[FL FR]}}'`