- Remove the `makeNixvimWithModule` module arg.
- Move standalone wrapper definitions to `wrappers.nix`
- Move `nixvimConfiguration` alias to `nixvim-configurations.nix`
The `import module args` pattern is useful for applying inputs from
outside of the module system, however it discards module location
metadata that is usually associated with file-path modules.
`lib.modules.importApply` solves that problem by wrapping the applied
module using `lib.modules.setDefaultModuleLocation`.
This means documentation, warnings, and errors will show the correct
location.
