Request: make music directory configurable

[GoSpursGoNL]

Great addon, very promising. I see the addon expects the music to be present in /share/owntone/music, however for Home Assistant is much more common to be at /media(/something). Would you be able to make this configurable?

In my current docker stack config (Owntone via Portainer, that I would like to replace with this addon) it is done as follows:

volumes:
  - /mnt/data/supervisor/share/owntone:/config
  - /mnt/data/supervisor/media/Music:/music

And then in owntone.conf it has:

# Directories to index
directories = { "/music" }