docs: use the dynamic README header endpoint

[AlemTuzlak]

Adopts the dynamic README header endpoint added in TanStack/tanstack.com#1076,
which is merged and live.

Every README banner in this repo now points a <picture> at
https://tanstack.com/api/readme/ instead of a committed PNG. The endpoint
renders 1800x450 in light and dark, so a branding change lands in every README
at once and dark-mode readers get a dark banner.

What changed

• 1 README(s) updated.

• Light and dark served through <picture>, per GitHub's guidance. The trailing <img> stays the light variant, as the fallback for renderers that ignore <picture> (npm, most editors).

• Deletes the now-unused media/header_config.png.

Verification

Every generated URL in this diff was requested against the live endpoint and
returned 200 image/png at 1800x450. git grep confirms no README still
references the old media/header_*.png path.

Heads up: deleting the committed PNG means npm pages for already-published
versions that embed the raw.githubusercontent.com/.../main/media/header_*.png
link will show a broken image, since that link is branch-pinned. New releases
pick up the endpoint URL.

Summary by CodeRabbit

• Documentation
  • Updated the README header image to adapt to light and dark themes.
  • Improved image accessibility text and display metadata.

[github-actions]

🚀 Changeset Version Preview

No changeset entries found. Merging this PR will not cause a version bump for any packages.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 7fb1488

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☁️ Nx Cloud last updated this comment at 2026-08-03 09:19:22 UTC

[pkg-pr-new]

npm i https://pkg.pr.new/@tanstack/eslint-config@408

npm i https://pkg.pr.new/@tanstack/publish-config@408

npm i https://pkg.pr.new/@tanstack/typedoc-config@408

npm i https://pkg.pr.new/@tanstack/vite-config@408

commit: 7fb1488

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: b7df61e9-03e3-4770-8ebe-6d2232961e58

📥 Commits

Reviewing files that changed from the base of the PR and between bfa1648 and 7fb1488.

⛔ Files ignored due to path filters (1)

• media/header_config.png is excluded by !**/*.png

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

README.md replaces the local header image with a responsive <picture> element. The element serves dark- and light-theme assets from TanStack-hosted configuration assets and includes updated alt text and width metadata.

Changes

README header image

Layer / File(s)	Summary
Responsive header image README.md	The README uses theme-specific hosted images in a responsive <picture> element. The image includes updated alt text and width metadata.

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

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main documentation change: using the dynamic README header endpoint.
Description check	✅ Passed	The description explains the changes, motivation, verification, and impact on previously published npm versions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch readme-header-endpoint

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