mux, udevmon, intercept, uinput: add page (#16667)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>
Co-authored-by: Dylan <145150333+dmmqz@users.noreply.github.com>
Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

pages/linux/intercept.md

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+# intercept
+
+> Read raw input events from a specified input event device and redirect it to stdout.
+> More information: <https://gitlab.com/interception/linux/tools/-/tree/master?ref_type=heads#intercept>.
+
+- Read and output raw input events from a given input device file (the system will not see any key presses):
+
+`sudo intercept -g {{/dev/input/eventX}}`
+
+- Read and output raw input events from a given input device file (the system can see key presses and does not block other programs from reading them):
+
+`sudo intercept {{/dev/input/eventX}}`

pages/linux/mux.md

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+# mux
+
+> Intercept and multiplex streams of input events.
+> More information: <https://gitlab.com/interception/linux/tools/-/tree/master?ref_type=heads#mux>.
+
+- Create a new muxer with a specified name:
+
+`mux -c {{muxer_name1 muxer_name2 ...}}`
+
+- Set the muxer's internal queue size (default is 100):
+
+`mux -s {{size}}`
+
+- Read input from a named muxer (can be repeated in "switch mode"):
+
+`mux -i {{input_muxer_name}}`
+
+- Write output to a named muxer (can be repeated):
+
+`mux -o {{output_muxer_name}}`

pages/linux/udevmon.md

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+# udevmon
+
+> Intercept and monitor input devices for launching tasks.
+> Filters or modifies events according to configuration file(s) (default: `/etc/interception/udevmon.d/*.yaml`).
+> More information: <https://gitlab.com/interception/linux/tools/-/tree/master?ref_type=heads#udevmon>.
+
+- Start udevmon with specified configuration file:
+
+`udevmon -c {{path/to/config.yaml}}`

pages/linux/uinput.md

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+# uinput
+
+> Intercept and write input events to a virtual keyboard device using /dev/uinput.
+> More information: <https://gitlab.com/interception/linux/tools/-/tree/master?ref_type=heads#uinput>.
+
+- Show resulting YAML device description merge and exit (dry-run):
+
+`uinput -p`
+
+- Merge YAML device description(s) to resulting virtual device:
+
+`sudo uinput -c {{path/to/device1.yaml path/to/device2.yaml ...}}`
+
+- Merge reference device description from device node(s) to resulting virtual device:
+
+`sudo uinput -d {{/dev/input/eventX /dev/input/eventY ...}}`