Wire all pages to navigation and fix broken links

- Add services, locations, and resources to footer navigation across all pages
- Update footer in 22+ files with consistent navigation structure
- Add service pages: competitive-intelligence, price-monitoring, data-cleaning
- Add location pages: london, manchester, birmingham
- Update all sitemaps (sitemap.php, sitemap.xml, sitemap-services.xml, sitemap-index.xml)
- Fix broken /contact links (changed to /#contact)
- Fix broken contact.php references (changed to /quote)
- Fix faq-enhanced.php with correct service links
- Fix london.php file permissions (600 -> 644)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

blog/articles/ai-powered-data-extraction.php

@@ -358,7 +358,7 @@ $breadcrumbs = [
                 <section class="article-cta">
                     <h2>Advanced AI Extraction Solutions</h2>
                     <p>Implementing AI-powered data extraction requires expertise in machine learning, data engineering, and domain-specific requirements. UK Data Services provides comprehensive AI extraction solutions, from custom model development to enterprise platform integration, helping organisations unlock the value in their unstructured data.</p>
-                    <a href="/contact" class="cta-button">Explore AI Extraction</a>
+                    <a href="/#contact" class="cta-button">Explore AI Extraction</a>
                 </section>
             </div>