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/manufacturing-supply-chain-optimization.php

@@ -358,7 +358,7 @@ $breadcrumbs = [
                 <section class="article-cta">
                     <h2>Optimise Your Supply Chain with Data-Driven Solutions</h2>
                     <p>This case study demonstrates the transformative power of integrated supply chain data and analytics. UK Data Services specialises in manufacturing and supply chain optimisation solutions that deliver measurable results and sustainable competitive advantages.</p>
-                    <a href="/contact" class="cta-button">Transform Your Supply Chain</a>
+                    <a href="/#contact" class="cta-button">Transform Your Supply Chain</a>
                 </section>
             </div>