Add vim and tree

hosts/nixedo/configuration.nix

@@ -2,6 +2,8 @@
 # your system.  Help is available in the configuration.nix(5) man page
 # and in the NixOS manual (accessible by running ‘nixos-help’).
 
+{ pkgs, ... }:
+
 {
   imports = [
     ../common
@@ -43,4 +45,9 @@
     80
     443
   ];
+
+  environment.systemPackages = with pkgs; [
+    tree
+    vim
+  ];
 }