Add "Built with Nix" badge

README.md

@@ -1,8 +1,9 @@
 # [devenv.sh](https://devenv.sh) - Fast, Declarative, Reproducible, and Composable Developer Environments
 
-[![Join Discord](https://img.shields.io/discord/1036369714731036712?color=7389D8&label=discord&logo=discord&logoColor=ffffff)](https://discord.gg/naMgvexb6q) 
-![License: Apache 2.0](https://img.shields.io/github/license/cachix/devenv) 
-[![version](https://img.shields.io/github/v/release/cachix/devenv?color=green&label=version&sort=semver)](https://github.com/cachix/devenv/releases) 
+[![Built with Nix](https://builtwithnix.org/badge.svg)](https://builtwithnix.org)
+[![Discord channel](https://img.shields.io/discord/1036369714731036712?color=7389D8&label=discord&logo=discord&logoColor=ffffff)](https://discord.gg/naMgvexb6q)
+![License: Apache 2.0](https://img.shields.io/github/license/cachix/devenv)
+[![Version](https://img.shields.io/github/v/release/cachix/devenv?color=green&label=version&sort=semver)](https://github.com/cachix/devenv/releases)
 [![CI](https://github.com/cachix/devenv/actions/workflows/buildtest.yml/badge.svg)](https://github.com/cachix/devenv/actions/workflows/buildtest.yml?branch=main)
 
 ![logo](docs/assets/logo.webp)