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/executive-functioning-skills-autism.md

@@ -122,25 +122,3 @@ Support Strategies:
 - Real-world problem-solving practice (e.g., managing group projects or conflicts)
 
 Building executive functioning skills in children with autism is a gradual and supportive process. With targeted strategies, visual supports, and consistent routines, children can develop greater independence, flexibility, and emotional resilience.
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- Previous Post 
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-###### [Guide to Teaching Self‑Advocacy in ABA](autism-self-advocacy-skills-aba)
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- Next Post 
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-###### [First/Then Cards: Empowering Transitions for Autistic Children](first-then-cards-autism-transitions)
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