Add more examples of helper scripts

[sminez]

Now that the filesystem interface is more mature its worthwhile spending a bit of time expanding the library of helper scripts that live in /data. Some good examples of things that people have done with acme can be found here:

• https://github.com/matheuristic/plan9port-config/tree/main/stow/dot-acme/bin
• https://github.com/evbogdanov/acme/tree/master/bin