[Gta04-owner] Debian/SD card installation instructions

[arne anka]

next reboot, sd card it is again ...

> there' still something wrong: changed /etc/network/interfaces and now  
> GTA04 does not boot from sd automatically anymore, need to press AUX to  
> get menu and then SD:1.
> let's see when it stops booting the sd card completly -- happened so far  
> with every debian installation so far after a while ...