Add an editor to the minimized image

[Dan Watkins]

Making even minor modifications to configuration is challenging at the moment, as no editor is installed whatsoever.

[Mantas Kriaučiūnas (mantas)]

I suggest nano - it's easier for users and smaller than vim

[Robert Bagwill (bobbagwill)]

snap install nano-editor?

[Joshua Powers (powersj)]

Added livecd-rootfs to comment on the requested change and marking cloud-images task invalid.

[Robert C Jennings (rcj)]

I've opened a track for livecd-rootfs where the minimal image is defined and I'm going to close the cloud-images portion.

But I will add that the images themselves set the expectation about what it is to be considered minimal as:

"This system has been minimized by removing packages and content that are
 not required on a system that users do not log into."

So I do not expect that an editor would be added.