Move developer configuration to dev layer

layers/dev.nix

 { pkgs, ... }:
 
 {
+  documentation.dev.enable = true;
+
   environment.systemPackages = with pkgs; [
     man-pages
+    posix_man_pages
+
+    # Dictionary (command `trans`)
+    translate-shell
   ];
 
-  users = {
-    users.dev = {
+  users.users = {
+    jens = {
+      packages = with pkgs; [ direnv ];
+    };
+
+    dev = {
       uid = 1300;
       isNormalUser = true;
       packages = with pkgs; [

layers/workstation.nix

@@ -3,11 +3,10 @@
 {
   imports = [
     ./desktop.nix
+    ./dev.nix
     #./vscode.nix
   ];
 
-  documentation.dev.enable = true;
-
   environment.systemPackages = with pkgs; [
     virtmanager
     keepassxc
@@ -16,17 +15,8 @@
     spotify
     gimp
     mumble
-
-    # Dictionary (command `trans`)
-    translate-shell
-
-    posix_man_pages
   ];
 
-  users.users.jens = {
-    packages = with pkgs; [ direnv ];
-  };
-
 
   users.users.adobe = {
     isNormalUser = true;