feat(user/malte): drop htop, configure btop

modules/base-system.nix

@@ -134,7 +134,6 @@ in {
       # Sops is for security
       sops
       # top is lacking pizzazz
-      htop
       btop
       # An initial `tailscale up` is necessary to get the network going
       tailscale

users/malte/shell.nix

@@ -172,6 +172,14 @@
     enable = true;
   };
 
+  programs.btop = {
+    enable = true;
+    settings = {
+      color_theme = "TTY";
+      theme_background = false;
+    };
+  };
+
   services.darkman.scripts."bat.sh" = let
     batConfigDir = "~/.config/bat";
     batConfig = "${batConfigDir}/config";