Add autologin and ethernet configuration functions
The commit introduces two new functions to the functions.sh file: configure_cli_autologin and configure_cli_ethernet. These functions are used for configuring autologin and ethernet respectively during the first setup. The changes replace the earlier approach of copying over getty@.service for autologin setup. The deleted file getty@.service isn't required as the autologin setup is now done via the configure_cli_autologin function call.