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>

kirby/nginx.conf

@@ -0,0 +1,21 @@
+server {
+    listen 80;
+    server_name robbis.space;
+
+    root /var/www/html/public;
+    index index.html;
+
+    # Serve static Hugo output
+    location / {
+        try_files $uri $uri/ =404;
+    }
+
+    # deploy.php webhook handler
+    location = /deploy.php {
+        root /var/www/html;
+        fastcgi_pass 127.0.0.1:9000;
+        fastcgi_index deploy.php;
+        include fastcgi_params;
+        fastcgi_param SCRIPT_FILENAME /var/www/html/deploy.php;
+    }
+}