I’m glad you might find it a useful app; it means I didn’t waste my time making the YunoHost package 
However, I have not tested the install script against the latest version of YunoHost, because I haven’t updated it since November. It doesn’t use a database or anything though, so you’ll probably be fine. Still, use caution if you cannot suffer any server downtime if something goes wrong.
Laverna saves notes locally in the browser using localStorage. You can easily lose notes if your browser removes this data. You might consider using the Etherpad app instead. Also, you might be insterested in Litewrite.