Add distribution-specific documentation for NixOS

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>

content/docs/distros/_index.md

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+---
+weight: 50
+title: Distros
+---
+
+# Distros
+
+You can read about distribution-specific instructions in this category. Just select your distribution on the sidebar.
+
+Feel free to contribute additional documentation about your distro here!

content/docs/distros/nixos.md

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+---
+title: NixOS
+---
+
+# NixOS
+
+General documentation about VR is provided on the [NixOS Wiki](https://wiki.nixos.org/wiki/VR).
+
+Short overview:
+- Monado is supported natively on NixOS using the [`services.monado`](https://search.nixos.org/options?channel=unstable&query=services.monado) since 24.05.
+- SteamVR works like it does on other distros for the most part. Though there are some issues regarding the fhsenv-sandbox
+  - [Asynchronous reprojection does not work](https://github.com/NixOS/nixpkgs/issues/217119) (without a kernel patch)
+  - [setcap doesn't work](https://github.com/NixOS/nixpkgs/issues/42117#issuecomment-996731579) (but can be done manually)
+- [Envision](../fossvr/envision) is currently being packaged in [this merge request](https://gitlab.com/gabmus/envision/-/merge_requests/11)
+  - [Asynchronous reprojection does not work](https://github.com/NixOS/nixpkgs/issues/217119) (without a kernel patch)