Add 4 new articles, internal links, llms.txt, sitemap update

- New articles: M&A due diligence automation, contract review automation,
  how to brief an AI consultant, build vs buy AI automation
- Related articles sections added to all 6 existing articles
- Blog index updated to list all 10 articles
- Sitemap updated with all 10 article URLs
- llms.txt created for AI search engine visibility
- case-studies/index.php: fix title, CSS path, logo path, JS path

llms.txt

@@ -0,0 +1,32 @@
+# UK AI Automation
+> AI automation consultancy for UK law firms and management consultancies.
+> We build document extraction pipelines, research automation systems, and custom AI agents.
+> Based in Norfolk, UK. Company: DataNorfolk Limited (No. 08576932).
+
+## Services
+- Document extraction: converting PDFs, Word documents, and scanned files into structured data
+- Research automation: monitoring, aggregating, and summarising information from multiple sources
+- Data pipeline build-outs: end-to-end automation from data source to output system
+- Custom AI agents: autonomous systems that gather information, reason, and take defined actions
+
+## Who We Work With
+- UK law firms (corporate, commercial, real estate, employment)
+- Management consultancies
+- Professional services firms handling significant document volumes
+
+## Key Topics Covered
+- AI document extraction for legal due diligence
+- M&A due diligence automation
+- Contract review automation (NDAs, employment contracts, commercial agreements)
+- Research automation for management consultancies
+- AI agents in professional services
+- GDPR compliance for AI automation systems
+- Build vs buy decisions for AI automation
+- ROI and business case for automation in professional services
+
+## Blog
+https://ukaiautomation.co.uk/blog/
+
+## Contact
+https://ukaiautomation.co.uk/quote
+info@ukaiautomation.co.uk