docs: restructure documentation

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

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+# Home Manager Module {#ch-hm-module}
+
+The Home Manager module allows us to customize the different `vim` options from inside the home-manager configuration
+and it is the preferred way of configuring neovim-flake, both on NixOS and non-NixOS systems.
+
+To use it, we first add the input flake.
+
+```nix
+{
+  inputs = {
+    obsidian-nvim.url = "github:epwalsh/obsidian.nvim";
+    neovim-flake = {
+      url = "github:notashelf/neovim-flake";
+      # 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 home-manager module somewhere in your configuration.
+
+```nix
+{
+  # assuming neovim-flake is in your inputs and inputs is in the argset
+  imports = [ inputs.neovim-flake.homeManagerModules.default ];
+}
+```
+
+An example installation for neovim-flake under standalone home-manager
+would look like this:
+
+```nix
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    home-manager.url = "github:nix-community/home-manager";
+    neovim-flake.url = "github:notashelf/neovim-flake";
+  };
+
+  outputs = { nixpkgs, home-manager, neovim-flake ... }: let
+  system = "x86_64-linux"; in {
+    # ↓ this is the home-manager output in the flake schema
+    homeConfigurations."yourUsername»" = home-manager.lib.homeManagerConfiguration {
+      pkgs = nixpkgs.legacyPackages.x86_64-linux;
+      modules = [
+        neovim-flake.homeManagerModules.default # <- this imports the home-manager module that provides the options
+        ./home.nix # your home-manager configuration, probably where you will want to add programs.neovim-flake options
+      ];
+    };
+  };
+}
+```
+
+Once the module is imported, we will be able to define the following options (and much more) from inside the
+home-manager configuration.
+
+```nix{
+  programs.neovim-flake = {
+    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}
+You may find all avaliable options in the [appendix](https://notashelf.github.io/neovim-flake/options)
+:::