[w3c/manifest] chore: update SchemaStore URLs to www.schemastore.org (PR #1220)

This change (choose at least one, delete ones that don't apply):

* Is a "chore" (metadata, formatting, fixing warnings, etc).

Commit message:

chore: update SchemaStore URLs to www.schemastore.org

`json.schemastore.org/web-manifest` and `schemastore.org/json/` now 301-redirect to `www.schemastore.org`, so the JSON Schema appendix links (and the `data-include` used to embed the schema) now point directly at the canonical host. No normative changes.

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<a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/pull/1220.html" title="Last updated on Jul 2, 2026, 12:46 PM UTC (1f2d404)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/1220/d5e2eeb...1f2d404.html" title="Last updated on Jul 2, 2026, 12:46 PM UTC (1f2d404)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1220

-- Commit Summary --

  * chore: update SchemaStore URLs to www.schemastore.org

-- File Changes --

    M index.html (6)

-- Patch Links --

https://github.com/w3c/manifest/pull/1220.patch
https://github.com/w3c/manifest/pull/1220.diff

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