fix: point documentation links at the migrated /docs/ URLs

[crbdev]

The user docs moved from docs.gravitykit.com to www.gravitykit.com/docs/ around 2026-05-01. Every reference in this repo still pointed at the old subdomain, so each one reached the new pages through a redirect chain.

This came out of a backlink audit for the docs migration (Linear MOPS-480 / MAR-148): docs.gravitykit.com still has 1,338 live backlinks from 120 referring domains, and this site is the largest single contributor.

Changes

File	What it is
docusaurus.config.js	Footer "Documentation" link — renders on every page, so it's the bulk of the count
src/pages/index.js	Homepage "official GravityKit Documentation" link
scripts/enhance-for-llms.mjs	Baked into the generated llms.txt, so AI assistants reading it were sent to the old host
README.md (×2)	Support section link, plus the @see URL in the PHPDoc example

The README @see example previously showed https://docs.gravitykit.com/article/123. The new docs have no numeric /article/<id> paths, so docblocks copied from that example would have taught the dead format. It now points at a real current URL.

Verification

• No docs.gravitykit.com references remain in the repo (excluding .git, node_modules, vendor).
• Both replacement URLs return 200 with zero redirects:
  • https://www.gravitykit.com/docs/
  • https://www.gravitykit.com/docs/gravityview/getting-started/how-to-setup-your-first-view/

No behavioural change beyond the link targets; nothing here affects hook generation or the build.

🤖 Generated with Claude Code

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