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/retail-competitor-monitoring-case.php

@@ -218,7 +218,7 @@ $read_time = 9;
                         <span>Competitive Intelligence Specialists</span>
                         <p style="margin-top: 0.5rem; margin-bottom: 0;">Our team specialises in building competitive monitoring systems that drive revenue growth and market advantage.</p>
                     </div>
-                    <a href="../../contact.php?subject=Competitor Monitoring&source=article" class="btn-contact-author">
+                    <a href="/quote?subject=Competitor Monitoring&source=article" class="btn-contact-author">
                         Discuss Your Project
                     </a>
                 </div>