to make sure closing session for user "dev" won't kill services, run as root:

loginctl enable-linger dev

then fix paths in services/nginx.service and run as dev

systemctl --user link ./nginx.service systemctl --user enable nginx.service systemctl --user start nginx.service

systemctl --user link ./nginx-reload.service systemctl --user enable nginx-reload.service systemctl --user enable nginx-reload.timer systemctl --user start nginx-reload.timer

journalctl --user -xe