Update NixOS

NixOS.md

@@ -6,6 +6,8 @@ I used [this guide](https://nixos.wiki/wiki/Wil_T_Nix_Guides) so if you follow a
 
 Depending on how you're feeling today, you should prepare an installation medium with either the graphical or minimal installer.
 
+### Configuring disks
+
 ```
 fdisk -l
 fdisk /dev/sdx
@@ -21,10 +23,9 @@ mount /dev/disk/by-label/NIX-BOOT /mnt/boot/efi
 swapon /dev/disk/by-label/SWAP
 ```
 
-<details>
-<summary>If you do not have an existing configuration repository.</summary>
+### Using `nixos-generate-config`
 
-(Automatically) generate a basic config using:
+If you do not have an existing configuration repository, or you just want to start from scratch, (automatically) generate a basic config using:
 
 ```
 nixos-generate-config --root /mnt
@@ -42,9 +43,9 @@ Then you can `cd /mnt` and `nixos-install`. When the installation is successful,
 
 Afterwards, you should change the password of your user. Then you can choose to build your configuration from here or integrate with an existing configuration.
 
-</details>
-<details>
-<summary>If you have a repository and you want to 'clone' an existing machine using flakes.</summary>
+### Using existing flake
+
+If you have a repository and you want to 'clone' an existing machine using [flakes](https://nixos.wiki/wiki/Flakes).
     
 Clone your repository and go inside the folder containing the `flake.nix` file.
     
@@ -58,6 +59,4 @@ Alternatively, if you don't want to clone the repository first:
 nixos-install --flake https://<url_to_your_repo>#<hostname>
 ```
 
-It is possible that you might have to append `--experimental-features nix-command --experimental-feautres flakes` if your system does not have those options enabled yet.
-
-</details>
+It is possible that you might have to append `--experimental-features 'nix-command flakes'` if your system does not have those options enabled yet.