Merge bc5eaf40ca into 07479c2e73

If a module is an attrset deduplicating imports does not work properly
and would lead to the module system complaining about redefining
options. Here is an example:

error: The option `age.identityPaths' in `/nix/store/wn50ysifrfp5qj5pp3jqpyvwh8ksz36y-source/machines/foo' is already declared in `/nix/store/wn50ysifrfp5qj5pp3jqpyvwh8ksz36y-source/common/ddclient/default.nix'.

when common/ddclient/default.nix and machines/foo/default.nix is:

{ ..., agenix, ... }: {
  imports = [
    agenix.nixosModules.age
  ];
}

Turning the module into a filepath fixes the issue.

README.md

@@ -205,7 +205,7 @@ You can run the CLI tool ad-hoc without installing it:
 nix run github:ryantm/agenix -- --help
 ```
 
-But you can also add it permanently into a [NixOS module](https://nixos.wiki/wiki/NixOS_modules) 
+But you can also add it permanently into a [NixOS module](https://wiki.nixos.org/wiki/NixOS_modules)
 (replace system "x86_64-linux" with your system):
 
 ```nix

flake.nix

@@ -23,13 +23,13 @@
   }: let
     eachSystem = nixpkgs.lib.genAttrs (import systems);
   in {
-    nixosModules.age = import ./modules/age.nix;
+    nixosModules.age = ./modules/age.nix;
     nixosModules.default = self.nixosModules.age;
 
-    darwinModules.age = import ./modules/age.nix;
+    darwinModules.age = ./modules/age.nix;
     darwinModules.default = self.darwinModules.age;
 
-    homeManagerModules.age = import ./modules/age-home.nix;
+    homeManagerModules.age = ./modules/age-home.nix;
     homeManagerModules.default = self.homeManagerModules.age;
 
     overlays.default = import ./overlay.nix;