docs: Fixed NixOS page (vectordotdev#18396)

* docs: Fixed NixOS page.

* whitespace

Signed-off-by: Jesse Szwedko <jesse.szwedko@datadoghq.com>

* Codeblock lint

Signed-off-by: Jesse Szwedko <jesse.szwedko@datadoghq.com>

---------

Signed-off-by: Jesse Szwedko <jesse.szwedko@datadoghq.com>
Co-authored-by: Jesse Szwedko <jesse.szwedko@datadoghq.com>

website/content/en/docs/setup/installation/operating-systems/nixos.md

@@ -1,14 +1,29 @@
 ---
 title: Install Vector on NixOS
 short: NixOS
-supported_installers: ["Nix", "Vector installer", "Docker"]
+supported_installers: ["Nix", "Docker"]
 weight: 6
 ---
 
-[Debian], also known as Debian GNU/Linux, is a Linux distribution composed of free and open-source software, developed by the community-supported Debian Project. This page covers installing and managing Vector on the Debian operating system.
+[NixOS] is a Linux distribution built on top of the Nix package manager. This
+page covers installing and managing Vector on NixOS.
+
+Nixpkgs has a [community maintained package][nixpkg-vector] for Vector. It can
+be installed on a NixOS system with the following snippet in
+`configuration.nix`:
+
+```nix
+environment.systemPackages = [
+  pkgs.vector
+];
+```
+
+See also the [Nix] package page.
 
 ## Supported installers
 
 {{< supported-installers >}}
 
-[debian]: https://debian.org
+[nixos]: https://www.nixos.org
+[nixpkg-vector]: https://github.com/NixOS/nixpkgs/tree/master/pkgs/tools/misc/vector
+[nix]: /docs/setup/installation/package-managers/nix