Migrate from Kirby CMS to Hugo with Gokarna theme

- Remove all Kirby/PHP files
- Add Hugo config with Gokarna theme as git submodule
- Add nginx + Hugo Dockerfile replacing PHP/Apache
- Update deploy.php to run hugo after git pull
- Update .gitignore for Hugo output

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

deploy.php

@@ -4,8 +4,7 @@
  * Called by Gitea on push to main branch.
  *
  * Set DEPLOY_SECRET in Gitea webhook settings and
- * configure the same value in the DEPLOY_SECRET env var
- * (or hardcode it below for simple setups).
+ * configure the same value in the DEPLOY_SECRET env var.
  */
 
 $secret = getenv('DEPLOY_SECRET') ?: '';
@@ -40,9 +39,9 @@ if ($ref !== 'refs/heads/main') {
     die('Ignored: not main branch.');
 }
 
-// Run git pull (HOME must be set explicitly since PHP's shell_exec doesn't inherit it)
+// Pull latest and rebuild
 putenv('HOME=/var/www');
-$output = shell_exec('git -C /var/www/html pull 2>&1');
+$output = shell_exec('cd /var/www/html && git pull 2>&1 && git submodule update --init --recursive 2>&1 && hugo 2>&1');
 
 http_response_code(200);
 header('Content-Type: text/plain');