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/database-optimization-big-data.php

@@ -655,7 +655,7 @@ class DatabaseTuner:
                 <section class="article-cta">
                     <h2>Expert Database Optimisation Services</h2>
                     <p>Optimising databases for big data requires deep expertise in query performance, distributed systems, and advanced database technologies. UK Data Services provides comprehensive database optimisation consulting, from performance audits to complete architecture redesign, helping organisations achieve optimal performance at scale.</p>
-                    <a href="/contact" class="cta-button">Optimise Your Database</a>
+                    <a href="/#contact" class="cta-button">Optimise Your Database</a>
                 </section>
             </div>