Peter Foster a4a8e237d6 SEO fixes: schema cleanup, duplicate redirects, sitemap, about page ...

- faq.php: replace deprecated FAQPage with WebPage, remove HowTo schema
- about.php: remove incorrect Dataset schema; add Credentials and
  Founder sections (576 -> 2059 words, E-E-A-T improvement)
- .htaccess: 301 redirects for 3 duplicate article pairs
  (airflow x2, kafka x2, real-time-analytics x2)
- Canonical tags updated on redirected source articles
- sitemap-blog.xml: add 4 missing articles, remove redirect slug (47->50)

2026-03-20 18:54:44 +00:00

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