feat(blog): recreate article footer navigation and related posts

- add reusable live-site-faithful blog footer component
- extract previous, next, and related post data from article content
- remove duplicated footer fragments from multilingual articles
- document the repeatable footer extraction workflow

www/src/content/blog/en/aba-therapy-dtt-net-guide.md

@@ -30,25 +30,3 @@ On the other hand, Natural Environment Training (NET) emphasizes learning within
 Integrating DTT and NET allows us to create a comprehensive therapeutic experience that meets the diverse needs of our learners. By employing both methodologies ensure not only the efficacy of learning, but also extend and apply the acquired skills across various settings.
 
 In Summary, leveraging the combined strengths of DTT and NET enhances our therapeutic practices, amplifying our capability to foster significant and lasting development.
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-###### [Understanding Sensory Processing in the Context of ABA Therapy](sensory-processing)
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-###### [Benefits of Prompting & Parenting in ABA Therapy](aba-therapy-prompting-parenting-benefits)
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