We want each machine not only to be exposed via nixosConfigurations but also as a module.
This allows re-importing the machine in tests and override the architecture for example.
This fixes building machines with the flake-parts module.
Since the inventory merges the machines, the `clan.core.meta` attribute
is now a submodule and conditionally imported.
Also drops the following attributes:
- clan.core.meta.icon
- clan.core.meta.description
In favor of specifying them inside the inventory.
This doesn't use `mkRemovedOptionsModule`, because in our case it would
cause infinite recursion.
This fixes building machines with the flake-parts module.
Since the inventory merges the machines, the `clan.core.meta` attribute
is now a submodule and conditionally imported.
Also drops the following attributes:
- clan.core.meta.icon
- clan.core.meta.description
In favor of specifying them inside the inventory.
This doesn't use `mkRemovedOptionsModule`, because in our case it would
cause infinite recursion.