Is there a config file that I can edit so that the pi starts with VNC enabled? I'm currently using raspbian stretch as an OS, and VNC works out of the box. The only thing I have to do is enable it from raspi-config. I use real vnc viewer on Fedora 29. Can I just put a file in /boot/ just like with ssh? My goal here is to make the pi boot up for the first time with vnc enabled.