Snapshot release 2023-05-09

This is a patch release for previously missing configurables of the new
auto-evaluation features.

Fixes

• Add configurations to enable/disable and customize auto-evaluations.
  nil.nix.flake.{autoArchive,autoEvalInputs,nixpkgsInputName}
  See ./docs/configuration.md for more details.

• autoEvalInputs is disabled by default due to issues (#79) about
  flake locks.

• Nixpkgs detection for NixOS options now checks existences of lib and
  module-list.nix to reduce mis-detections. (#80)