docs(blog): recategorize world's fastest package manager post as technical

[NathanFlurry]

• Recategorize the world's fastest package manager post from changelog to technical (moves its URL from /changelog to /blog)
• Update the registry post's cross-link to the new /blog path
• Rename the benchmark source link label from Source to Benchmarks

[claude]

Review

Small, well-scoped content change. Verified the logic:

• /src/pages/blog/[...slug].astro and /src/pages/changelog/[...slug].astro route posts based on category === 'changelog' vs everything else, so recategorizing to technical correctly moves the post from /changelog/... to /blog/.... technical is a valid enum value per CATEGORIES in website/src/lib/article.tsx / .claude/reference/content-frontmatter.md.
• Grepped the repo for other references to worlds-fastest-package-manager — the only cross-link is the one updated in this PR. The reverse link (registry post → this post) is the one being fixed; the other direction (this post → registry post, which stays category: changelog) still correctly points at /changelog/... and didn't need a change.
• The post is dated published: "2026-07-07" (not yet live relative to the PR), so no redirect is needed for the old /changelog/... URL — it was never public.
• "Benchmarks" is a more accurate label than "Source" for a link to a benchmark repo.

No bugs, no test coverage concerns (content-only change), nothing else to flag. LGTM.

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