Home configurations do not show up in flake output

[TakodaS]

Describe the bug

Home configurations do not show up on flake outputs, unlike darwin configurations and system configurations.

To Reproduce

Steps to reproduce the behavior:

1. Clone the home manager template nix flake init -t github:numtide/blueprint#home-manager-standalone
2. Run nix flake show
3. No homeConfigurations or homeConfigs to be found.

Expected behavior

Ideally an output with different homeConfigurations would be shown, but even just homeConfigurations: unknown would be fine to be commensurate with darwinConfigurations: unknown and systemConfigs: unknown. Even homeModules: unknown makes its appearance.

[Yethal]

They're visible under legacyPackages.${system}

[sei40kr]

I ran into a related issue: nh expects homeConfigurations at the top level, so placing them under legacyPackages.${system} silently breaks compatibility with it.

Would it be possible to also expose homeConfigurations at the top level (in addition to the current location under legacyPackages)? This would make blueprint consistent with darwinConfigurations and nixosConfigurations, which are already top-level.

Happy to submit a PR if this direction is acceptable.