docs: rename all instances of neovim-flake to nvf

docs/manual/installation/modules/nixos.md

@@ -1,3 +1,82 @@
 # NixOS Module {#ch-nixos-module}
 
-This artice is a stub. It will be written as the NixOS module is finalized.
+The NixOS module allows us to customize the different `vim` options from inside
+the NixOS configuration without having to call for the wrapper yourself. It is
+the recommended way to use **nvf** alongside the home-manager module depending
+on your needs.
+
+To use it, we first add the input flake.
+
+```nix
+{
+  inputs = {
+    obsidian-nvim.url = "github:epwalsh/obsidian.nvim";
+    nvf = {
+      url = "github:notashelf/nvf";
+      # you can override input nixpkgs
+      inputs.nixpkgs.follows = "nixpkgs";
+      # you can also override individual plugins
+      # for example:
+      inputs.obsidian-nvim.follows = "obsidian-nvim"; # <- this will use the obsidian-nvim from your inputs
+    };
+  };
+}
+```
+
+Followed by importing the NixOS module somewhere in your configuration.
+
+```nix
+{
+  # assuming nvf is in your inputs and inputs is in the argset
+  # see example below
+  imports = [ inputs.nvf.nixosModules.default ];
+}
+```
+
+## Example Installation {#sec-example-installation}
+
+```nix
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    nvf.url = "github:notashelf/nvf";
+  };
+
+  outputs = { nixpkgs, nvf, ... }: let
+  system = "x86_64-linux"; in {
+    # ↓ this is your host output in the flake schema
+    nixosConfigurations."yourUsername»" = nixpkgs.lib.nixosSystem {
+      modules = [
+        nvf.nixosModules.default # <- this imports the NixOS module that provides the options
+        ./configuration.nix # <- your host entrypoint
+      ];
+    };
+  };
+}
+```
+
+Once the module is properly imported by your host, you will be able to use the
+`programs.nvf` module option anywhere in your configuration in order to
+configure **nvf**.
+
+```nix{
+  programs.nvf = {
+    enable = true;
+    # your settings need to go into the settings attribute set
+    # most settings are documented in the appendix
+    settings = {
+      vim.viAlias = false;
+      vim.vimAlias = true;
+      vim.lsp = {
+        enable = true;
+      };
+    };
+  };
+}
+```
+
+::: {.note}
+**nvf** exposes a lot of options, most of which are not referenced in the
+installation sections of the manual. You may find all avaliable options
+in the [appendix](https://notashelf.github.io/nvf/options)
+:::