chore: bump nimbus version to 0.14.1

[MohamedH1998]

Summary

Updates Nimbus Docs from 0.11.0 to 0.14.1 and applies the corresponding integration migrations. This adds the Nimbus migration baseline, moves partial ID resolution into the generated Markdown configuration, updates the docs route to the current page-props API, and ignores the generated coordinates manifest.

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Acknowledged by author (1)

Review	File	Issue	Note
Code	src/pages/[...slug].astro line 40	Removed partial-heading collection option	The author says the warning is a false positive: nimbus-docs 0.14.1's getDocsPageProps accepts only the Astro global and recursively merges headings from <Render file="..." /> partials at build time (verified on a generated page), so restoring the removed partialHeadings argument would be type-invalid and duplicate the replacement mechanism.

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This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
*	@cloudflare/product-owners
*.ts	@cloudflare/content-engineering
package.json	@cloudflare/content-engineering
*.astro	@cloudflare/content-engineering

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[MohamedH1998]

Skipping the warning because the reported regression is not present in Nimbus 0.14.1.

getDocsPageProps now accepts only the Astro global, and its public API states that headings from <Render file="..." /> partials are recursively merged at build time. The 0.14.1 implementation builds prepared heading records with mergePartialHeadings(...) and uses markdown.partialResolver to map Cloudflare's product/file IDs. The generated /r2/reference/wrangler-commands/ page also confirms that headings from partials/workers/wrangler-commands/r2.mdx are present in the TOC.

Restoring the removed partialHeadings argument would therefore be type-invalid and would duplicate the replacement mechanism.