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>

openspec/changes/add-minimal-hugo-site/proposal.md

@@ -0,0 +1,15 @@
+## Why
+The current markusgraf.ch website uses static HTML files. Converting to Hugo will provide a maintainable template-based structure that simplifies future content updates and enables easy addition of new sections (CV, blog) without duplicating code.
+
+## What Changes
+- Initialize Hugo project structure with standard directories
+- Create base layout template with Bootstrap 5.x integration
+- Set up reusable partials (header, footer, navigation)
+- Convert existing HTML content to Hugo templates
+- Configure Hugo site settings
+- Add static assets from current website
+
+## Impact
+- Affected specs: hugo-site (new capability)
+- Affected code: This is a greenfield implementation - no existing code affected
+- Migration: Current static HTML will be referenced to recreate in Hugo templates