Comprehensive SEO and UI improvements across site

SEO Improvements:
- Add Twitter/OG meta tags to gdpr-compliance.php and terms-of-service.php
- Add author bios with E-E-A-T signals to all blog articles
- Add breadcrumb schema markup to key pages
- Create new service pages: price-monitoring.php, competitive-intelligence.php
- Create location pages: london.php, manchester.php, birmingham.php
- Update sitemap.xml with new pages

UI/CSS Improvements:
- Move testimonials section from inline styles to CSS classes
- Standardize hero gradients to #144784 → #179e83 across all pages
- Unify card border styles to border-left: 4px solid #179e83
- Fix CTA gradient direction consistency on location pages
- Standardize breadcrumb colors to #144784
- Replace all purple accent colors (#667eea, #764ba2) with brand colors
- Add CSS variables for brand consistency in main.css

Code Cleanup:
- Delete 6 emergency CSS fix files (button-emergency-fix.css, etc.)
- Remove related-articles-fix.css references from blog articles
- Consolidate styles into main.css

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

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

blog/articles/manufacturing-data-transformation.php

@@ -40,8 +40,8 @@ $breadcrumbs = [
     <meta property="og:title" content="<?php echo htmlspecialchars($article_title); ?>">
     <meta property="og:description" content="<?php echo htmlspecialchars($article_description); ?>">
     <meta property="og:type" content="article">
-    <meta property="og:url" content="https://www.ukdataservices.com/blog/articles/<?php echo $article_slug; ?>">
-    <meta property="og:image" content="https://www.ukdataservices.com<?php echo $hero_image; ?>">
+    <meta property="og:url" content="https://ukdataservices.co.uk/blog/articles/<?php echo $article_slug; ?>">
+    <meta property="og:image" content="https://ukdataservices.co.uk<?php echo $hero_image; ?>">
     <meta property="article:author" content="<?php echo htmlspecialchars($article_author); ?>">
     <meta property="article:published_time" content="<?php echo $article_date; ?>T09:00:00+00:00">
     <meta property="article:modified_time" content="<?php echo $last_modified; ?>T09:00:00+00:00">
@@ -49,9 +49,9 @@ $breadcrumbs = [
     <meta name="twitter:card" content="summary_large_image">
     <meta name="twitter:title" content="<?php echo htmlspecialchars($article_title); ?>">
     <meta name="twitter:description" content="<?php echo htmlspecialchars($article_description); ?>">
-    <meta name="twitter:image" content="https://www.ukdataservices.com<?php echo $hero_image; ?>">
+    <meta name="twitter:image" content="https://ukdataservices.co.uk<?php echo $hero_image; ?>">
     
-    <link rel="canonical" href="https://www.ukdataservices.com/blog/articles/<?php echo $article_slug; ?>">
+    <link rel="canonical" href="https://ukdataservices.co.uk/blog/articles/<?php echo $article_slug; ?>">
     
     <link rel="stylesheet" href="/assets/css/main.css">
     <link rel="preconnect" href="https://fonts.googleapis.com">
@@ -66,7 +66,7 @@ $breadcrumbs = [
         "@type": "BlogPosting",
         "headline": "<?php echo htmlspecialchars($article_title); ?>",
         "description": "<?php echo htmlspecialchars($article_description); ?>",
-        "image": "https://www.ukdataservices.com<?php echo $hero_image; ?>",
+        "image": "https://ukdataservices.co.uk<?php echo $hero_image; ?>",
         "datePublished": "<?php echo $article_date; ?>T09:00:00+00:00",
         "dateModified": "<?php echo $last_modified; ?>T09:00:00+00:00",
         "author": {
@@ -78,12 +78,12 @@ $breadcrumbs = [
             "name": "UK Data Services",
             "logo": {
                 "@type": "ImageObject",
-                "url": "https://www.ukdataservices.com/assets/images/logo.svg"
+                "url": "https://ukdataservices.co.uk/assets/images/logo.svg"
             }
         },
         "mainEntityOfPage": {
             "@type": "WebPage",
-            "@id": "https://www.ukdataservices.com/blog/articles/<?php echo $article_slug; ?>"
+            "@id": "https://ukdataservices.co.uk/blog/articles/<?php echo $article_slug; ?>"
         },
         "keywords": "<?php echo htmlspecialchars($article_keywords); ?>"
     }
@@ -330,6 +330,8 @@ $breadcrumbs = [
                 </section>
             </div>
             
+            <?php include($_SERVER['DOCUMENT_ROOT'] . '/includes/author-bio.php'); ?>
+
             <?php include($_SERVER['DOCUMENT_ROOT'] . '/includes/article-footer.php'); ?>
         </div>
     </article>