The parenthetical enumerating the public flake inputs named three of the
eight now present, so it is stated as a rule rather than a list that drifts
each time an input is added.
The bootstrap-ordering note also said the install consumes the flake from
Gitea, contradicting the later explanation that disko-install reads a local
clone and fetches nothing of ours. Both describe the same requirement, so
the first now states it as the clone it is.