hosts: move doas to its own module

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

hosts/minimal.nix

@@ -1,29 +1,5 @@
 { config, pkgs, ... }:
 {
-  security = {
-    sudo.enable = false;
-    doas = {
-      enable = true;
-      extraRules = [
-        {
-          groups = [ "wheel" ];
-          keepEnv = true;
-          persist = true;
-        }
-      ];
-    };
-  };
-
-  environment.systemPackages = with pkgs; [
-    git
-    htop
-    vim
-    tmux
-    wireguard-tools
-    nmap
-    gcc
-  ];
-
   nix = {
     extraOptions = ''
       experimental-features = nix-command flakes