Include qr code with ssh onion domain for phones.

- [ ] Also allow the user to copy their (ssh) onion domain through a qr code (in case copy pasting from server is difficult).
- [ ] Write adb script to get the onion domain from qr code on usb connected phone, then get the root ca and add it to the phone's trusted root ca's.
- [ ] Ideally, write an (android) app that directly gets the root ca from the qr code and adds it to the phone's trusted root ca's.