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/entrypoint.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+set -e
+
+# Start PHP-FPM
+PHP_FPM=$(find /usr/sbin -name 'php-fpm*' | head -1)
+$PHP_FPM
+
+# Initial Hugo build
+cd /var/www/html
+git submodule update --init --recursive
+hugo
+
+# Start nginx in foreground
+nginx -g 'daemon off;'