[TOC] Fix 56 rendered-heading scrape failures from deprecated container renderer imports

[mvvmm]

What changed

src/util/rendered-toc.ts used the deprecated loadRenderers([getContainerRenderer()]) + AstroContainer.create({ renderers }) API to render MDX pages at build time for TOC heading extraction. This path failed with ERR_UNSUPPORTED_ESM_URL_SCHEME: Received protocol 'astro:' for 56 pages that use AnchorHeading (which emits headings at runtime via set:html).

Replaced with AstroContainer.create({}) + container.addServerRenderer() using direct server.js imports — the same pattern already used in src/util/container.ts.

Results

Metric	Before	After
TOC scrape failures	56	0
Deprecated renderer import type hints	4	0
Pages built	8,802	8,802

Checklist

• pnpm run check — 0 errors
• pnpm run build — 8,802 pages, no new warnings
• pnpm exec prettier — clean

[github-actions]

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

Pattern	Owners
*.ts	@cloudflare/content-engineering, @kodster28

[mvvmm]

/rebase

[cloudflare-docs-bot]

Review

✅ No issues found in commit 399aae8.

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