Remove unused React Header component

[Copilot]

Header component existed in two locations with different implementations: inline HTML in index.html and a React component in frontend/components/Header.tsx. The React component was dead code—never imported or used anywhere.

Changes

• Deleted frontend/components/Header.tsx (unused React component)
• Removed empty frontend/ directory

Analysis

• Site uses vanilla HTML/CSS/JS with Vite—no React dependencies in package.json
• The React header had different nav links (missing "Services") vs the HTML header
• Inline HTML header in index.html is the active implementation

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Original prompt

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This section details on the original issue you should resolve

<issue_title>🔴 CRITICAL: Consolidate duplicate Header component implementations</issue_title>
<issue_description>## Problem
Header component exists in two locations with different implementations:

1. Inline HTML: index.html (lines 12-25) - Static HTML with nav menu
2. React Component: frontend/components/Header.tsx - Separate React implementation

Impact

• Code duplication makes maintenance difficult
• Inconsistent styling and behavior between implementations
• Confusion about which is the "source of truth"
• Risk of diverging implementations over time
• Harder to apply design system updates consistently

Files Involved

• index.html - Contains inline header HTML
• frontend/components/Header.tsx - Contains React header component
• Related styles in style.css and component-specific styles

Recommended Solution

Option A: Full React Migration (Recommended)

• Migrate entire site to use React components
• Remove inline HTML header
• Use consistent React component architecture

Option B: Pure HTML/CSS

• Remove React component
• Keep inline HTML implementation
• Simplify tech stack if React isn't needed elsewhere

Acceptance Criteria

• Single source of truth for header component
• All pages use the same header implementation
• Styling consistent across all uses
• Navigation links uniform across implementations
• Documentation updated to reflect architecture decision
• Dead code removed

Implementation Steps

1. Audit: Determine which pages use which header
2. Decide: Choose React or HTML as primary approach
3. Migrate: Update all pages to use chosen implementation
4. Remove: Delete unused header code
5. Test: Verify header works consistently across site
6. Document: Update architecture docs

Priority

🔴 HIGH - Architecture consistency and maintainability</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes 🔴 CRITICAL: Consolidate duplicate Header component implementations #49

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