meta: Merge home-manager and user module with system

Makes it easier to create a working and pre-configured system with
minimal configuration.

containers/shared.nix

@@ -50,13 +50,12 @@
   ];
 
   users = {
-    mutableUsers = false;
     allowNoPasswordLogin = true;
 
     users = {
       user = {
-        isNormalUser = true;
-        home = "/home/user";
+        password = lib.mkForce null;
+        extraGroups = lib.mkForce [ ];
       };
     };
   };

modules/home-manager.nix

@@ -1,18 +0,0 @@
-{
-  home-manager = {
-    useGlobalPkgs = true;
-    useUserPackages = true;
-
-    sharedModules = [{
-      home.stateVersion = "22.11";
-      programs.man.generateCaches = true;
-    }];
-
-    users = {
-      user = {
-        home.username = "user";
-        home.homeDirectory = "/home/user";
-      };
-    };
-  };
-}

modules/system.nix

@@ -77,5 +77,35 @@ in
     system = {
       inherit (cfg) stateVersion;
     };
+
+    users = {
+      mutableUsers = false;
+
+      users = {
+        user = {
+          isNormalUser = true;
+          uid = 1000;
+          password = "user";
+          extraGroups = [ "wheel" "networkmanager" ];
+        };
+      };
+    };
+
+    home-manager = {
+      useGlobalPkgs = true;
+      useUserPackages = true;
+
+      sharedModules = [{
+        home.stateVersion = "22.11";
+        programs.man.generateCaches = true;
+      }];
+
+      users = {
+        user = {
+          home.username = "user";
+          home.homeDirectory = "/home/user";
+        };
+      };
+    };
   };
 }

modules/user.nix

@@ -1,14 +0,0 @@
-{
-  users = {
-    mutableUsers = false;
-
-    users = {
-      user = {
-        isNormalUser = true;
-        uid = 1000;
-        password = "user";
-        extraGroups = [ "wheel" "networkmanager" ];
-      };
-    };
-  };
-}