use home-manager

remove some unneeded gnome apps
install btop and htop alias

configuration.nix

@@ -8,6 +8,7 @@
   imports =
     [ # Include the results of the hardware scan.
       ./hardware-configuration.nix
+      <home-manager/nixos>
     ];
 
   # Use the GRUB 2 boot loader.
@@ -44,9 +45,32 @@
     enable = true;
     displayManager.gdm.enable = true;
     desktopManager.gnome.enable = true;
+    excludePackages = with pkgs; [ xterm ];
   };
 
-  
+  home-manager.users.pim = { pkgs, ... }: {
+    programs.home-manager.enable = true;
+    programs.bash = {
+      enable = true;
+      shellAliases = {
+        htop = "btop";
+      };
+    };
+
+    home.username = "pim";
+    home.homeDirectory = "/home/pim";
+    home.stateVersion = "23.05";
+    home.packages = with pkgs; [ firefox ];
+
+    # Let home-manager manage the X session
+    xsession = {
+      enable = true;
+    };
+
+    programs.alacritty = {
+      enable = true;
+    };
+  };
 
   # Configure keymap in X11
   # services.xserver.layout = "us";
@@ -66,9 +90,6 @@
   users.users.pim = {
     isNormalUser = true;
     extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
-    packages = with pkgs; [
-      firefox
-    ];
   };
 
   # List packages installed in system profile. To search, run:
@@ -78,8 +99,11 @@
     wget
     curl
     git
+    btop
   ];
 
+  environment.gnome.excludePackages = with pkgs; [ gnome-tour gnome.epiphany gnome.geary ];
+
   # Some programs need SUID wrappers, can be configured further or are
   # started in user sessions.
   # programs.mtr.enable = true;