Automatically creates and updates symlinks from sources to destinations

1. create a config file from model conf.dist.json and put it wherever you'd like
2. update systemd/symlinks_watcher.service:
   • use your main user instead of nobody (use a user that has permissions to the folders you ant to watch)
   • set /path/to/node/bin
   • set /path/to/bin/watch_folder
3. copy systemd/symlinks_watcher.service to /etc/systemd/system/
4. activate the service running sudo systemctl activate symlinks_watcher.service
5. start the service running sudo systemctl start symlinks_watcher.service