Add /sitemap.xml alias and strengthen README GEO/brand signals

[Copilot]

This addresses the docs sitemap discoverability gap (/sitemap.xml returning 404) and improves README entity signals called out in the GEO audit (freshness, RSS, and sameAs-style references).

• Sitemap discoverability

  • Added a static docs alias at docs/public/sitemap.xml that points crawlers to the generated Astro sitemap index.
  • Keeps existing @astrojs/sitemap output model (sitemap-index.xml + shard files) unchanged.

• Robots sitemap alignment

  • Updated docs/public/robots.txt to advertise:
    • https://github.github.com/gh-aw/sitemap.xml
  • Ensures the declared sitemap URL matches an address that resolves directly.

• README GEO / entity signal upgrades

  • Added a visible freshness marker (Last updated).
  • Added docs RSS link (/blog/rss.xml).
  • Added a compact sameAs-style “Find us” link set (repo/org/topic surface).
  • Documented canonical-meta limitation for GitHub-rendered README pages.

<!-- docs/public/sitemap.xml -->
<?xml version="1.0" encoding="UTF-8"?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <sitemap>
    <loc>https://github.github.com/gh-aw/sitemap-index.xml</loc>
  </sitemap>
</sitemapindex>

[github-actions]

Hey @copilot-swe-agent 👋 — thanks for picking up the sitemap and README brand signal work! A few things to address before this is ready for review:

• No diff yet — the PR currently has 0 changed files and 0 lines modified. The task checklist in the body is a good plan, but the actual implementation needs to land before this can be evaluated. Mark the PR ready-for-review once the changes are committed.
• Split the concerns — this PR mixes two distinct areas: (1) fixing the missing /sitemap.xml in the Astro docs build and (2) improving README brand/entity signals (freshness date, RSS link, sameAs). These are independently deployable — consider opening one PR per concern so reviewers can focus and roll back cleanly if needed.
• Add a real description — the PR body is currently just an agent task checklist. Replace or supplement it with a brief human-readable summary: what is broken/missing, why it matters, and what specifically was changed.
• Tests / validation — once changes land, include evidence of validation (e.g. that /sitemap.xml resolves, or a build output snippet).

If you'd like a hand completing this, assign the following to your coding agent:

This is a draft WIP PR on branch `copilot/plan-add-sitemap-and-improve-readme`.

Please complete the following two tasks, ideally in separate commits:

1. **Sitemap fix**: Ensure the Astro docs site emits a valid `/sitemap.xml` and that `robots.txt` references it correctly. Verify by running the Astro build and confirming the file is present in the output.

2. **README brand signals**: Add a freshness date, an RSS feed link, and sameAs brand/entity structured-data links to the project README.

After each change, run the relevant build/lint/validation commands to confirm nothing is broken. Update the PR body with a plain-language summary of what was changed and why.

Generated by ✅ Contribution Check · ● 13.3M · ◷

[Copilot]

Pull request overview

Adds a static /sitemap.xml alias in the docs site to fix a 404 on that path, repoints robots.txt at that new alias, and inserts a "GEO/entity signals" block (freshness date, RSS link, schema.org-style sameAs link list, and a canonical-meta note) near the top of the README.

Changes:

• New docs/public/sitemap.xml static file that wraps the existing sitemap-index.xml in a one-entry sitemap index.
• docs/public/robots.txt Sitemap: directive switched from sitemap-index.xml to the new /sitemap.xml alias.
• README prepended with a Last-updated date, RSS link, a Find us (sameAs) link list, and an HTML comment about canonical meta tag limitations.

Show a summary per file

File	Description
README.md	Adds freshness date, RSS link, sameAs-style link list, and canonical-meta HTML comment above the existing release note.
docs/public/sitemap.xml	New static sitemap-index that points at sitemap-index.xml to make /sitemap.xml resolve.
docs/public/robots.txt	Updates the advertised Sitemap: URL to the new /sitemap.xml alias.

Copilot's findings

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• Files reviewed: 3/3 changed files
• Comments generated: 4