SEO: all remaining items — bak cleanup, sitemap, homepage, FAQ schema, inline links

- Delete all .bak files from web root (security fix)
- Regenerate sitemap-blog.xml with all 41 articles and correct lastmod dates
- Improve homepage meta description (more specific, no contract mention)
- Add FAQPage schema to Python pipeline article (4 Q&As)
- Fix London analytics article: author, meta description updated
- Add contextual inline links to 4 articles -> service pages
- Remove includes.bak.20260210 directory

blog/articles/data-quality-validation-pipelines.php

@@ -373,7 +373,7 @@ $read_time = 9;
                             <h4><a href="data-automation-strategies-uk-businesses.php">Data Automation Strategies for UK Businesses</a></h4>
                             <span class="read-time">9 min read</span>                        <article class="related-card">
                             <span class="category">Business Intelligence</span>
-                            <h4><a href="competitive-intelligence-roi-metrics.php">Measuring ROI from Competitive Intelligence Programmes</a></h4>
+                            <h4><a href="competitive-intelligence-roi-metrics.php">Measuring ROI from <a href="/services/competitive-intelligence.php" title="competitive intelligence services UK">Competitive Intelligence</a> Programmes</a></h4>
                             <span class="read-time">8 min read</span>                        <article class="related-card">
                             <span class="category">Compliance</span>
                             <h4><a href="web-scraping-compliance-uk-guide.php">Complete Guide to Web Scraping Compliance in the UK</a></h4>