added script for activation and set vim as default (like it should be)

activate-config.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+_hostname="$(hostname)"
+if [[ "$_hostname" == "nixos" || "$_hostname" == "" ]]; then
+    echo 'Please set your hostname to somethin meaningful with `hostname $NAME`!'
+    exit 1
+fi
+cd "/etc/nixos"
+if [[ ! -d "systems/$_hostname" ]]; then
+    mkdir "systems/$_hostname"
+    ln ./*.nix "systems/$_hostname"
+fi
+for _sysconf in "systems/$_hostname/"*".nix"; do
+    if [[ ! -f "$(basename $_sysconf)" ]]; then
+        ln "$_sysconf" .
+    fi
+done

modules/generic.nix

@@ -30,6 +30,7 @@ in
     atop = {
       enable = true;
     };
+    vim.defaultEditor = true;
   };
 
   users.defaultUserShell = pkgs.zsh;