configuration.nix: update root password for 22x

[sarcasticadmin]

Description

This matches what the root password is for the servers for 22x and had some docs to the readme from the testing done in: #13

Tests

• Confirmed I was able to login via the expected root password in the vmTest:

$ nix run .#vm -- -display sdl,gl=off -device qxl-vga,xres=7680,yres=4320,vgamem_mb=512
warning: Git tree '/home/rherna/workspace/scale-kiosk' is dirty
Disk image do not exist, creating the virtualisation disk image...
Formatting '/tmp/tmp.JhGeSsriA7', fmt=raw size=1073741824
mke2fs 1.47.0 (5-Feb-2023)
Discarding device blocks: done
Creating filesystem with 262144 4k blocks and 65536 inodes
Filesystem UUID: af6fb1a6-2bf4-438f-ad31-939cb0f0fdc1
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376

Allocating group tables: done
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

Virtualisation disk image created.


<<< Welcome to NixOS 24.05.20240228.9099616 (x86_64) - ttyS0 >>>


pi login: root
Password:

[root@pi:~]#