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/understanding-autism-support.md

@@ -44,25 +44,3 @@ Remember, each child with autism is unique. By educating yourself, seeking suppo
 For more information on services offered by AIA or to book your free consultation, visit us at [https://www.azinstitute4autism.com](../index), call us at [(480) 687-7099](tel:+14806877099), or email [hello@azinstitute4autism.com](mailto:hello@azinstitute4autism.com).
 
 If you are looking for more tips, check out [monthly blog posts](../library) from AIA’s clinical director, Rula Diab!
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- Previous Post 
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-###### [The Ultimate Guide to Behavior Modification Techniques & Reinforcement Theory](behavior-modification-techniques-reinforcement-theory)
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- Next Post 
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-###### [Enhancing Generalization for Broader Impact in Autism](enhancing-generalization-skills)
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-### Similar Blog Posts
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-#### [The Benefits of ABA Therapy for Children with Autism](aba-therapy-benefits)
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-![2024 new year reflection and planning for autism support and awareness - hero image](/assets/images/hero-new-year-goals-2024.webp)
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-#### [New Year 2024: Holiday Tips for Autism Support & Awareness](new-year-2024-autism-holiday-tips)
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-#### [Repetitive Behaviors with Children Diagnosed with Autism](repetitive-behavior)