[docs] add package root to sys.path
[docs] add package root to sys.path

fixes #173

insomnia-lab/libreant,insomnia-lab/libreant,ael-code/libreant,leophys/libreant,insomnia-lab/libreant,ael-code/libreant,leophys/libreant,leophys/libreant,ael-code/libreant,ael-code/libreant,insomnia-lab/libreant,leophys/libreant