update dotfiles

nix/configuration.nix

@@ -45,10 +45,13 @@
   # List packages installed in system profile. To search, run:
   # $ nix search wget
   environment.systemPackages = with pkgs; [
+    cachix
     firefox
+    inkscape
     unzip
     vim
     wget
+    xclip
     zathura
     zsh
   ];
@@ -119,6 +122,8 @@
     shell = pkgs.zsh;
   };
 
+  nix.trustedUsers = [ "root" "haak" ];
+
   # This value determines the NixOS release with which your system is to be
   # compatible, in order to avoid breaking some software such as database
   # servers. You should change this only after NixOS release notes say you