Update Nix docs

Author: sestrella

docs/NIX.md

@@ -9,20 +9,24 @@
 ## Project Structure
 
 The project uses:
+
 - Nix Flakes for reproducible builds and development environments
 - `stacklock2nix` for deriving Nix packages from stack.yaml.lock
 - `devenv` for creating consistent development environments
 
 ### Flake.nix
 
 The flake.nix file has the following inputs:
+
 - `nixpkgs`: Standard Nix packages repository
 - `stacklock2nix`: A tool for generating Nix packages from stack.yaml.lock files
 
 The flake outputs:
+
 - `packages.default`: The Hapistrano package for each supported system
 - `overlays.default`: An overlay for integrating Hapistrano into other Nix
   systems
+- `templates.default`: A template showing how to install Hapistrano using devenv
 
 ## Development Environments
 

flake.nix

@@ -51,7 +51,7 @@
         hapistrano = self.packages.${prev.system}.default;
       };
       templates.default = {
-        description = "Install Hapistrano via devenv";
+        description = "Install Hapistrano using devenv";
         path = ./templates/default;
       };
     };