Update nix-config.mdx

src/content/docs/en/configuration/nix-config.mdx

@@ -1,11 +1,11 @@
 ---
-title: Nix
+title: Athena Nix Configuration
 description: How to manage Nix configuration in Athena OS.
 ---
 import ImageComponent from "@components/ImageComponent.astro";
 import ThemedImage from '@components/ThemedImage.astro';
 
-## Athena Nix Tree
+## Tree Structure
 
 The macrostructure of Athena Nix configuration elements is the following:
 ```
@@ -239,6 +239,8 @@ If you need to integrate additional software in your system, add them in `/etc/n
 
 If you are in a virtualized environment, tweak the related settings in `/etc/nixos/modules/hardware/virtualization/guest.nix`
 
+All the files in `/etc/nixos/home-manager` are related to the configuration impacting the home directory or the user profile.
+
 They are just few examples. Familiarize with the Athena Nix configuration macrostructure to unlock the full potential of your environment!
 
 ## Error Handling