docs: restructure documentation

docs/manual/installation/standalone/home-manager.md

@@ -0,0 +1,37 @@
+# Standalone Installation (home-manager) {#ch-standalone-home-manager}
+
+The following is an example of a barebones vim configuration with the default theme enabled.
+
+```nix
+{
+  inputs.neovim-flake = {
+    url = "github:notashelf/neovim-flake";
+    inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = {nixpkgs, neovim-flake, ...}: let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+    configModule = {
+      # Add any custom options (and feel free to upstream them!)
+      # options = ...
+
+      config.vim = {
+        theme.enable = true;
+      };
+    };
+
+    customNeovim = neovim-flake.lib.neovimConfiguration {
+      modules = [configModule];
+      inherit pkgs;
+    };
+  in {
+    # this is an example nixosConfiguration using the built neovim package
+    homeConfigurations = {
+      yourHostName = home-manager.lib.nixosSystem {
+        # TODO
+      };
+    };
+  };
+}
+```