fix(seo): delete the retired Alchemy migration blog post

[Jordy-Baby]

What

Deletes blog/2025-12-3-migrating-alchemy-subgraphs-to-envio.md. Nothing else.

Why

The post was retired in #1038 and vercel.json 301s /blog/migrating-alchemy-subgraphs-to-envio to /docs/HyperIndex/migrate-from-alchemy. That redirect is correct and stays.

The markdown file was never removed, so Docusaurus kept generating a sitemap entry for it. The sitemap is what we hand Google as our list of canonical pages, so Google crawls the blog URL because we asked it to, gets a 301, and files it under "Page with redirect".

Same defect as /explorer in enviodev/ui#1212, which is what triggered the Search Console sitemap alert on 22 Aug. This one is queued to trigger the next one.

Verification

• Ran a full docusaurus build with onBrokenLinks: "throw". Passed, so nothing links to the post.
• Built sitemap goes from 206 URLs to 205. The only URL removed is the blog post. /docs/HyperIndex/migrate-from-alchemy is still listed.
• Ran the postbuild validate-llms.js gate. Passed, 0 warnings, 83 chain redirect targets checked, 0 broken.
• Both redirect targets confirmed live at 200, the page and its .md copy.
• static/blog-posts-index.json regenerates from blog/ in prebuild, so it drops the entry automatically. Confirmed by running the generator, 80 posts to 79, 0 alchemy entries.

Not included

static/blog-assets/migrating-alchemy-subgraphs.png is now unreferenced. Left in place rather than sweeping unrelated cleanup into this PR.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Removed the guide covering migration from Alchemy Subgraphs to Envio, including its FAQs, instructions, and related links.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
envio-docs	Ready	Preview	Aug 26, 2026 8:31pm

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📥 Commits

Reviewing files that changed from the base of the PR and between c1c59b5 and fdd9095.

📒 Files selected for processing (1)

• blog/2025-12-3-migrating-alchemy-subgraphs-to-envio.md

💤 Files with no reviewable changes (1)

• blog/2025-12-3-migrating-alchemy-subgraphs-to-envio.md

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📝 Walkthrough

Walkthrough

The pull request deletes the blog post about migrating Alchemy subgraphs to Envio, including its metadata, migration guide, FAQs, instructions, and promotional links.

Changes

Cohort / File(s)	Summary
Blog content removal blog/2025-12-3-migrating-alchemy-subgraphs-to-envio.md	Deletes the complete migration blog post.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to fdd90

This localized change removes a retired blog post while preserving its redirect and related documentation entries; no actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: deleting the retired Alchemy migration blog post to address SEO behavior.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files.

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