This reverts commit 066ba0c5cf. After
further discussion, we want to maintain this as the naming scheme going
forward to be similar to standards that have been trying to be
implemented in naming configurations and modules.
Add a flake-parts module, output as flakeModules.home-manager and flakeModules.default.
The module defines options for flake.homeModules and flake.homeConfigurations, based on the respective nixos equivalents; flake.nixosModules and flake.nixosConfigurations.