update/format configuration for jack

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

hosts/server/variables.nix

@@ -1,4 +1,8 @@
-{ config, lib, ... }: {
+{
+  config,
+  lib,
+  ...
+}: {
   imports = [
     # Choose your theme here:
     ../../themes/nixy.nix
@@ -7,7 +11,9 @@
   config.var = {
     hostname = "jack";
     username = "hadi";
-    configDirectory = "/home/" + config.var.username
+    configDirectory =
+      "/home/"
+      + config.var.username
       + "/.config/nixos"; # The path of the nixos configuration directory
 
     keyboardLayout = "fr";
@@ -30,7 +36,7 @@
   options = {
     var = lib.mkOption {
       type = lib.types.attrs;
-      default = { };
+      default = {};
     };
   };
 }