Update sidebar paths to include /docs/pre-recorded-audio/ and /docs/streaming/ prefixes

[devin-ai-integration]

Summary

Updates the Fern docs sidebar configuration so that pages in the Pre-recorded STT tab resolve under /docs/pre-recorded-audio/ and pages in the Streaming STT tab resolve under /docs/streaming/.

Navigation changes:

• async-stt tab: changed from skip-slug: true → slug: pre-recorded-audio
• streaming-stt tab: changed from skip-slug: true → slug: streaming
• Both tabs' Models sections changed from explicit slugs (pre-recorded-audio / /streaming) to skip-slug: true, since the tab slug now provides the prefix
• Pages that previously had absolute slugs containing the prefix (e.g. /pre-recorded-audio/select-the-speech-model, /streaming/concurrency) were converted to relative slugs (e.g. /select-the-speech-model, /concurrency) so the tab-level slug provides the prefix without doubling
• Several absolute slugs in the Streaming Models section were also converted to relative slugs (/turn-detection → turn-detection, /whisper-streaming → whisper-streaming, /medical-mode → medical-mode, /message-sequence → message-sequence)
• Two slug renames beyond prefix changes:
  • Evaluations (pre-recorded): /evaluations/pre-recorded-audio → /evaluations (resolves to /docs/pre-recorded-audio/evaluations)
  • Streaming endpoints: /streaming-endpoints-and-data-zones → /endpoints-and-data-zones (resolves to /docs/streaming/endpoints-and-data-zones)
• Hidden overview page slug changed from /pre-recorded-audio → overview (resolves to /docs/pre-recorded-audio/overview)
• Legacy pre-recorded audio overview page: explicit slug removed (inherits from file path)

Redirect changes:

• ~50 existing redirect destinations updated to point to new URLs
• ~100 new redirects added for old URLs → new URLs (features, guides, migration guides, getting-started pages)
• 3 redirects at the bottom of the file that previously pointed FROM /docs/pre-recorded-audio/{page} TO /docs/{page} were reversed (for supported-languages, language-detection, code-switching)
• Removed the catch-all redirect source: /docs/streaming → destination: /docs/streaming/select-the-speech-model

Review & Testing Checklist for Human

• Verify no redirect loops exist. Several redirects were reversed (e.g. supported-languages, language-detection, code-switching). Check that no source URL matches another redirect's destination in a way that creates a cycle.
• Deploy a preview and spot-check that relative slugs resolve correctly. All page slugs now rely on the tab-level slug for the prefix. Confirm URLs like /docs/pre-recorded-audio/webhooks, /docs/streaming/concurrency, /docs/pre-recorded-audio/keyterms-prompting actually render (not 404 or doubled).
• Verify the Models section URLs are unchanged. The strategy changed from section slug: pre-recorded-audio / section slug: /streaming to tab slug + section skip-slug: true. Net URLs for pages like /docs/pre-recorded-audio/universal-3-pro and /docs/streaming/universal-3-pro should remain the same.
• Check the two slug renames resolve correctly and have proper redirects. Evaluations: old /docs/evaluations/pre-recorded-audio should redirect to /docs/pre-recorded-audio/evaluations. Streaming endpoints: old /docs/streaming-endpoints-and-data-zones should redirect to /docs/streaming/endpoints-and-data-zones.
• Test high-traffic redirect paths end-to-end. Particularly: /docs/webhooks, /docs/getting-started/transcribe-an-audio-file, /docs/getting-started/transcribe-streaming-audio, /docs/language-detection, /docs/supported-languages.

Recommended test plan: Deploy a preview build and:

1. Navigate directly to old URLs (e.g. /docs/webhooks, /docs/guides/subtitles, /docs/streaming-endpoints-and-data-zones) and confirm they redirect to the correct new location
2. Navigate the Pre-recorded STT and Streaming STT sidebars and verify all links work
3. Confirm URLs in the browser include the expected /pre-recorded-audio/ or /streaming/ prefix
4. Verify that /docs/streaming resolves as the tab landing page (no 404)

Notes

• Pages in other tabs (Overview, API Reference, Voice Agents, Speech Understanding, Guardrails, LLM Gateway, FAQ) are not affected by this change.
• Hidden/legacy pages also had their slugs updated to maintain consistency.
• Some redirect destinations that referenced pages outside these two tabs (e.g. /docs/account-management, /docs/guardrails/*) were intentionally left unchanged.
• Fern prepends tab slugs to all child page slugs (including those starting with /), which is why page slugs were converted to relative form rather than keeping absolute paths with the prefix.

Link to Devin session: https://app.devin.ai/sessions/5ed562868e764248b53fd2fd2462de9d
Requested by: @LeeVaughn

[devin-ai-integration]

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