Mark archlinux/base as deprecated and remove it at a later date

We need to add a deprecation notice to https://hub.docker.com/r/archlinux/base since we now push to archlinux/archlinux.

At a later date we need to remove it, when would be a good date?

Also, while we are at it, archlinux/archlinux could use a nice logo, desc and links to this repo.