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>

.gitignore

@@ -1,51 +1,9 @@
-# System files
-# ------------
+# Hugo output
+/public/
 
-Icon
+# OS
 .DS_Store
 
-# Temporary files
-# ---------------
-
-/media/*
-!/media/index.html
-
-# Lock files
-# ---------------
-
-.lock
-
 # Editors
-# (sensitive workspace files)
-# ---------------------------
-*.sublime-workspace
 /.vscode
 /.idea
-
-# -------------SECURITY-------------
-# NEVER publish these files via Git!
-# -------------SECURITY-------------
-
-# Cache Files
-# ---------------
-
-/site/cache/*
-!/site/cache/index.html
-
-# Accounts
-# ---------------
-
-/site/accounts/*
-!/site/accounts/index.html
-
-# Sessions
-# ---------------
-
-/site/sessions/*
-!/site/sessions/index.html
-
-# License
-# ---------------
-
-/site/config/.license
-/site/config/config.starterkit.test.php