📝 add documentation on udev

docs/documenting.md

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+Documentation of the `master` branch is deployed to Netlify automatically.
+
+To host or develop locally:
+
+- install python3 and pip
+- `pip install mkdocs mkdocs-material`
+- `mkdocs serve` and visit [localhost:8000](http://localhost:8000).
+
+The file `runtime.txt` is necessary to tell Netlify to use Python3.