docs: Move standalone usage to modules section

docs/man/default.nix

@@ -34,11 +34,11 @@
       cat \
         ${./nixvim-header-start.5} \
         ${mkMDSection ../user-guide/helpers.md} \
-        ${mkMDSection ../user-guide/extending-config.md} \
         ${mkMDSection ../user-guide/faq.md} \
         ${./nixvim-header-end.5} \
         >$out/nixvim-header.5
     '';
+  # FIXME add platform specific docs to manpage
 in
   runCommand "nixvim-configuration-reference-manpage" {
     nativeBuildInputs = [installShellFiles nixos-render-docs];

docs/mdbook/SUMMARY.md

@@ -4,12 +4,12 @@
 
 - [Installation](./user-guide/install.md)
 - [Helpers](./user-guide/helpers.md)
-- [Extending a standalone configuration](./user-guide/extending-config.md)
 - [FAQ](./user-guide/faq.md)
 
-# Module Specific Options
+# Platforms
 
 - [Home Manager Usage](./modules/hm.md)
+- [Standalone Usage](./modules/standalone.md)
 
 # Options
 

docs/modules/standalone.md

@@ -1,4 +1,13 @@
-# Extending a standalone configuration
+# Standalone Usage
+
+## Options
+
+When used standalone, nixvim's options are available directly, without any prefix/namespace.
+This is unlike the other modules which typically use a `programs.nixvim.*` prefix.
+
+There are **no** standalone-specific options available.
+
+## Extending an existing configuration
 
 Given a `nvim` derivation obtained from `makeNixvim` or `makeNivxmiWithModule` it is possible to create a new derivation with additional options.
 
@@ -6,7 +15,7 @@ This is done through the `nvim.nixvimExtend` function. This function takes a Nix
 
 This attribute is recursive, meaning that it can be applied an arbitrary number of times.
 
-## Example
+### Example
 
 ```nix
 {makeNixvimWithModule}: let
@@ -24,3 +33,4 @@ in
 ```
 
 This will generate a `init.lua` that will contain the three comments from each stages.
+