feat: initialize Hugo static site with Bootstrap 5.x

Initialize minimal Hugo site structure with Bootstrap 5.3.2 integration for
markusgraf.ch conversion. Implements OpenSpec proposal add-minimal-hugo-site.

Features:
- Hugo project structure with standard directories
- Base layout template (baseof.html) with Bootstrap 5.3.2 via CDN
- Homepage (index.html) and single page (single.html) templates
- Reusable partials: header, footer, navigation
- Responsive Bootstrap grid layout
- Mobile-first design with semantic HTML5
- Valid HTML output with basic accessibility features
- Taxonomies disabled for minimal site (see docs/TAXONOMIES.md)

Documentation:
- IMPLEMENTATION_SUMMARY.md - Complete implementation guide
- docs/TAXONOMIES.md - Guide for re-enabling categories/tags
- static/README.md - Guide for placing static assets

Configuration:
- hugo.toml configured for markusgraf.ch
- .gitignore for Hugo build artifacts

All 24 tasks from OpenSpec proposal completed successfully.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

content/_index.md

@@ -0,0 +1,20 @@
+---
+title: "Welcome"
+description: "Personal website of Markus Graf"
+---
+
+# Welcome to Markus Graf's Website
+
+This is a placeholder homepage. Replace this content with the actual content from your existing markusgraf.ch website.
+
+## About
+
+Add your introduction and about section here.
+
+## Skills
+
+List your skills and expertise here.
+
+## Contact
+
+Add your contact information here.