[Website] Improve SEO Pt. 2

[tobias-tengler]

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[Copilot]

Pull request overview

This PR continues the website SEO work by improving share-card image handling (Open Graph/Twitter + RSS), tightening canonical redirects, and ensuring key hub pages are represented in the sitemap.

Changes:

• Add a dedicated share-card image variant to the image optimization pipeline and expose a helper to resolve the correct share image URL.
• Improve sitemap generation by explicitly including top-level hub pages outside the (content) route group.
• Refine nginx redirect behavior (relative Location headers behind upstream TLS, single-hop slash handling) and update various docs/blog links/structure.

Reviewed changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
website-next/src/image-optimization/manifest.ts	Adds shareSrc to the manifest shape and a helper to resolve share-card image URLs.
website-next/src/image-optimization/generate.mjs	Extends the optimizer to generate/cache a dedicated share-card JPEG and prune it as needed.
website-next/scripts/optimize-images.mjs	Configures share-card generation for featured blog images by scanning blog frontmatter.
website-next/nginx/conf.d/redirects.conf	Updates redirect targets, makes key legacy rules tolerate trailing slashes, and moves slash-stripping to a final rule.
website-next/nginx/conf.d/default.conf	Disables absolute redirects so Location headers don’t downgrade to http:// behind upstream TLS termination.
website-next/content/docs/hotchocolate/guides/testing.md	Removes the guide (content relocation/restructure).
website-next/content/docs/hotchocolate/guides/schema-evolution.md	Removes the guide (content relocation/restructure).
website-next/content/docs/hotchocolate/guides/public-api.md	Removes the guide (content relocation/restructure).
website-next/content/docs/hotchocolate/guides/private-api.md	Removes the guide (content relocation/restructure).
website-next/content/docs/hotchocolate/guides/performance.md	Removes the guide (content relocation/restructure).
website-next/content/docs/hotchocolate/guides/mcp-adapter.md	Removes the guide (content relocation/restructure).
website-next/content/docs/hotchocolate/guides/federation.md	Removes the guide (content relocation/restructure).
website-next/content/docs/hotchocolate/guides/error-handling.md	Removes the guide (content relocation/restructure).
website-next/content/docs/hotchocolate/guides/dynamic-schemas.md	Removes the guide (content relocation/restructure).
website-next/content/docs/hotchocolate/build/adapters/openapi.md	Updates “Next Steps” links to the new MCP and Errors docs locations.
website-next/content/docs/hotchocolate/build/adapters/mcp.md	Updates “Next Steps” link to the new Errors docs location.
website-next/content/blog/2026-05-11-hot-chocolate-16.md	Updates doc links to the new build/adapters locations.
website-next/app/sitemap.ts	Adds explicit sitemap entries for homepage and docs/blog hubs with accurate last-modified timestamps.
website-next/app/blog/rss.xml/route.ts	Uses share-card images as RSS enclosures with a basic MIME type resolver.
website-next/app/blog/[...slug]/page.tsx	Switches OG/Twitter images to the share-card variant when available.

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