Initial commit: complete WebsiteBox project

Docker-based self-hosted WordPress deployment system with:
- Four-container stack (nginx, wordpress/php-fpm, mariadb, certbot)
- Automatic SSL via Let's Encrypt with self-signed fallback
- First-boot WordPress setup via WP-CLI (GeneratePress + child theme, plugins)
- Interactive setup wizard and one-line install script
- Backup, update, healthcheck, and SSL renewal scripts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/UPDATING.md

@@ -0,0 +1,59 @@
+# Updating WebsiteBox
+
+## Quick Update
+
+```bash
+cd ~/websitebox
+./scripts/update.sh
+```
+
+The update script will:
+
+1. Check for local modifications to tracked files (warns and aborts if found)
+2. Show you what's changing before applying
+3. Ask for confirmation
+4. Pull the latest code
+5. Pull updated Docker base images
+6. Rebuild containers with any changes
+7. Clean up old Docker images
+8. Run any required migrations
+9. Verify all containers are healthy
+
+## What Gets Updated
+
+| Component | How it updates |
+|-----------|---------------|
+| WebsiteBox configs (nginx, docker-compose, entrypoints) | `update.sh` pulls from git |
+| Base Docker images (nginx, MariaDB) | `docker compose pull` via update script |
+| WordPress core (minor/security) | Automatic via WordPress auto-updates |
+| WordPress core (major) | Manual via WordPress admin GUI |
+| Plugins (Wordfence, UpdraftPlus, Age Gate) | Manual via WordPress admin GUI |
+| GeneratePress parent theme | Manual via WordPress admin GUI |
+| WebsiteBox child theme | `update.sh` pulls from git |
+
+## Before Updating
+
+- Your site data in `websitebox-data/` is never modified by updates
+- If you've edited any tracked files (Dockerfiles, nginx configs, etc.), the update script will warn you
+- Consider running a backup first: `./scripts/backup.sh`
+
+## After Updating
+
+Check that everything is working:
+
+```bash
+./scripts/healthcheck.sh
+```
+
+Visit your site and wp-admin to verify normal operation.
+
+## Rollback
+
+If an update causes issues:
+
+```bash
+cd ~/websitebox
+git log --oneline -5          # Find the previous commit
+git checkout <commit-hash>    # Revert to that commit
+docker compose up -d --build  # Rebuild with previous code
+```