Moved default SSH keys to a shared `common.nix` module for better reusability and maintainability. Updated references in both NixOS and Darwin user modules to use the centralized keys. This reduces redundancy and improves consistency across modules.
Added a `.keep` file to the `git` directory to ensure its presence in the user's home structure. This aligns with the convention of maintaining stub files for empty directories.
The user's extraGroups in the NixOS module now contains 'wheel' by default. This change provides the user with more privileges. Consequently, 'wheel' has been removed from the SGX-Attic's 'user.extraGroups' as it became redundant.
Harald Hoyer