Fix invalid breadcrumb parents in docs navigation

[danstotts-ops]

Summary

• give the Templates API navigation group a real parent URL
• flatten the single-page Release notes tab to avoid a linkless parent crumb
• add a raw-HTML breadcrumb JSON-LD validator for preview and production checks

Evidence

Google Search Console currently reports Missing field "item" (in "itemListElement") for:

• /api-reference/templates/POST/templates
• /release-notes

The live raw HTML confirms both first breadcrumb entries omit item.

Validation

• python3 -m json.tool docs.json
• python3 -m py_compile scripts/validate-breadcrumb-jsonld.py
• npx -y mintlify@latest broken-links (reports the existing four relative links in CLAUDE.md)

After the Mintlify preview deploys, run:

python3 scripts/validate-breadcrumb-jsonld.py --base-url <preview-url> /api-reference/templates/POST/templates /release-notes

This PR does not publish production.

[mintlify]

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Project	Status	Preview	Updated (UTC)
runpod-docs	🟢 Ready	View Preview	Jul 16, 2026, 2:40 PM

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[mintlify]

Preview deployment for your docs. Learn more about Mintlify Previews.

Project	Status	Preview	Updated (UTC)
runpod-docs	🟡 Building	–	Jul 16, 2026, 2:39 PM

💡 Tip: Enable Workflows to automatically generate PRs for you.