modules: restructure modules directory

modules/devos/hm-system-defaults.nix

@@ -0,0 +1,22 @@
+{ config, lib, ... }: {
+  home-manager = {
+    extraSpecialArgs = {
+      main = config;
+    };
+
+    sharedModules = [
+      {
+        home.sessionVariables = {
+          inherit (config.environment.sessionVariables) NIX_PATH;
+        };
+        xdg = {
+          configFile."nix/registry.json".text = config.environment.etc."nix/registry.json".text;
+          enable = true;
+        };
+      }
+      (lib.mkIf config.services.xserver.enable {
+        xsession.enable = true;
+      })
+    ];
+  };
+}

modules/devos/nix-path.nix

@@ -0,0 +1,7 @@
+{ channel, inputs, ... }: {
+  nix.nixPath = [
+    "nixpkgs=${channel.input}"
+    "nixos-config=${../../lib/compat/nixos}"
+    "home-manager=${inputs.home}"
+  ];
+}