Initial commit: Quartz NixOS module as flake

- quartz.nix: NixOS module for Quartz static site hosting
- flake.nix: Flake wrapper exposing nixosModules.quartz

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,38 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+This repository contains a single NixOS module (`quartz.nix`) that provides a service for hosting Quartz static sites. Quartz is a fast, batteries-included static site generator that transforms Markdown content into full featured websites.
+
+## Architecture
+
+The module creates a complete deployment system:
+
+1. **Git-based content management** - Clones and pulls content from a configurable git repository
+2. **Build service** (`quartz-pull-and-build.service`) - Handles npm install and `npx quartz build`
+3. **Timer** - Periodic rebuilds (default: every 15 minutes) as fallback
+4. **Webhook server** (optional) - Listens for Forgejo/GitHub push events to trigger immediate rebuilds
+5. **nginx vhost** - Serves the built static files with ACME/SSL
+
+Key assumption: nginx and ACME must be configured elsewhere in the NixOS configuration.
+
+## Testing Changes
+
+To test this module, include it in a NixOS configuration:
+
+```nix
+{ pkgs, ... }:
+{
+  imports = [ ./quartz.nix ];
+
+  services.quartz = {
+    enable = true;
+    domain = "docs.example.com";
+    gitRepo = "https://git.example.com/user/quartz-notes.git";
+  };
+}
+```
+
+Validate syntax with: `nix-instantiate --parse quartz.nix`