added common environment file, fixed sudo issue

modules/common/environment.nix

@@ -0,0 +1,20 @@
+{ lib, pkgs, ... }: {
+  # Common packages that every system will use
+  environment.systemPackages = with pkgs; [
+    git
+    vim
+    neovim
+    usbutils
+    coreutils
+    lshw
+    systemd
+    dmidecode
+    pciutils
+    nix-ld
+    patchelf
+    htop
+  ];
+
+  # Common environment variables that every system will use
+  environment.variables.EDITOR = "nvim";
+}