SEO fixes: team section, meta tags, footer consistency, broken links

- Add leadership team section to about.php with 4 team members
- Add visible FAQ section to homepage with accordion functionality
- Fix broken blog category link (legal-&-compliance → compliance)
- Add Twitter Card and og:image meta tags to data-cleaning.php and quote.php
- Add social links to 5 pages missing them (data-cleaning, quote, case-studies, blog/search, faq-enhanced)
- Standardize LinkedIn URLs across 24 blog files (remove www prefix)
- Fix social media placeholder links across 8 pages
- Optimize meta descriptions on 3 service pages (under 160 chars)

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

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

blog/categories/data-analytics.php

@@ -316,7 +316,7 @@ $og_image = "https://ukdataservices.co.uk/assets/images/blog/data-analytics-cate
             <div class="footer-bottom">
                 <p>&copy; <?php echo date('Y'); ?> UK Data Services. All rights reserved.</p>
                 <div class="social-links">
-                    <a href="https://www.linkedin.com/company/uk-data-services" aria-label="LinkedIn" rel="noopener" target="_blank">
+                    <a href="https://linkedin.com/company/uk-data-services" aria-label="LinkedIn" rel="noopener" target="_blank">
                         <img src="../../assets/images/icon-linkedin.svg" alt="LinkedIn" loading="lazy">
                     </a>
                     <a href="https://twitter.com/ukdataservices" aria-label="Twitter" rel="noopener" target="_blank">