* treewide: fix usage of flake-info
* flakes: drop github:tweag/nickel for IFD
* flakes: drop github:pinpox/nixos for infinite recursion
* flakes: drop github:srid/emanote for IFD
* flakes: drop gitlab:simple-nixos-mailserver/nixos-mailserver for undefined option
* flakes: drop stream-alert-bot for possible infinite recursion
* flakes: drop github:astro/microvm.nix for undefined attribute