Comprehensive SEO and UI improvements across site

SEO Improvements:
- Add Twitter/OG meta tags to gdpr-compliance.php and terms-of-service.php
- Add author bios with E-E-A-T signals to all blog articles
- Add breadcrumb schema markup to key pages
- Create new service pages: price-monitoring.php, competitive-intelligence.php
- Create location pages: london.php, manchester.php, birmingham.php
- Update sitemap.xml with new pages

UI/CSS Improvements:
- Move testimonials section from inline styles to CSS classes
- Standardize hero gradients to #144784 → #179e83 across all pages
- Unify card border styles to border-left: 4px solid #179e83
- Fix CTA gradient direction consistency on location pages
- Standardize breadcrumb colors to #144784
- Replace all purple accent colors (#667eea, #764ba2) with brand colors
- Add CSS variables for brand consistency in main.css

Code Cleanup:
- Delete 6 emergency CSS fix files (button-emergency-fix.css, etc.)
- Remove related-articles-fix.css references from blog articles
- Consolidate styles into main.css

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

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

contact-handler.php

@@ -329,10 +329,10 @@ $emailHTML = '
     <style>
         body { font-family: Arial, sans-serif; line-height: 1.6; color: #333; }
         .container { max-width: 600px; margin: 0 auto; padding: 20px; }
-        .header { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; padding: 20px; text-align: center; }
+        .header { background: linear-gradient(135deg, #144784 0%, #179e83 100%); color: white; padding: 20px; text-align: center; }
         .content { background: #f9f9f9; padding: 20px; }
-        .field { margin-bottom: 15px; padding: 10px; background: white; border-left: 4px solid #667eea; }
-        .field-label { font-weight: bold; color: #667eea; }
+        .field { margin-bottom: 15px; padding: 10px; background: white; border-left: 4px solid #179e83; }
+        .field-label { font-weight: bold; color: #144784; }
         .footer { text-align: center; padding: 20px; color: #666; font-size: 12px; }
     </style>
 </head>