docs: add Telnyx integration page

[cshape]

Summary

Adds a Telnyx page to the Integrations section (requested by Telnyx — they now host Fish Audio as a curated TTS provider with in-call playback).

• New developer-guide/integrations/telnyx.mdx following the existing integration-page conventions: what Telnyx is (their own site wording), where Fish Audio fits, the curated-voice policy and FishAudio.<Model>.<VoiceId> format, WebSocket streaming + REST examples, and links to Telnyx's docs.
• Telnyx logo mark as the page icon (images/telnyx-logo.svg, brand green #00E3AA sampled from their favicon — works in light and dark mode).
• Drive-by fix: the Pipecat sidebar icon was invisible in dark mode (black PNG on transparent). Wrapped it in an SVG that inverts to white under prefers-color-scheme: dark.

Testing

Both code examples were run against the live Telnyx API with a Fish voice and produce valid MP3 audio.

Also verified: page renders correctly in mint dev (light + dark), nav entry added to docs.json, mint broken-links reports no issues outside the pre-existing temp/ templates.

Note: no speak-mintlify-hash / AudioTranscript block yet — left for the audio-generation tooling's next pass.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a17154c1-6b5f-4b14-a549-3c057303948a

📥 Commits

Reviewing files that changed from the base of the PR and between b24f88d and 002c4f5.

📒 Files selected for processing (2)

• api-reference/openapi.json
• developer-guide/integrations/telnyx.mdx

📝 Walkthrough

Walkthrough

Adds a Telnyx integration page covering setup, voices, WebSocket streaming, REST synthesis, and reference links. The page is added to integrations navigation, and the Pipecat icon reference changes from PNG to SVG.

Changes

Telnyx integration documentation

Layer / File(s)	Summary
Telnyx integration overview developer-guide/integrations/telnyx.mdx	Adds page metadata, prerequisites, Telnyx/Fish Audio relationship details, and curated voice naming guidance.
Telnyx API examples developer-guide/integrations/telnyx.mdx	Documents WebSocket MP3 streaming, REST synthesis, response formats, and provider resources.
Integration navigation and metadata docs.json, developer-guide/integrations/pipecat.mdx	Adds Telnyx to the Integrations navigation and changes the Pipecat icon asset from PNG to SVG.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• fishaudio/docs#30: Adds an integration page through the same docs.json Integrations navigation group.
• fishaudio/docs#83: Restructures and introduces the Integrations navigation grouping.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: adding a Telnyx integration documentation page.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/telnyx-integration

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[coderabbitai]

Actionable comments posted: 3

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@developer-guide/integrations/telnyx.mdx`:
- Line 21: Update the emotion control link in the Telnyx integration
documentation to use the relative path ../best-practices/emotion-control instead
of the root-relative path, while leaving the surrounding text unchanged.
- Line 11: Add a Python prerequisite alongside the Telnyx account requirement in
the integration guide, specifying installation of websockets version 14 or newer
with the appropriate pip command. Mention that this version is required for the
WebSocket example’s additional_headers argument.
- Around line 81-91: The Telnyx REST curl example should demonstrate saving MP3
audio. Update the request payload with voice_settings specifying format "mp3"
and a supported 44100 sample rate, and add --output output.mp3 to the curl
command while preserving the existing endpoint and authentication.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f7c64f3e-8e62-4e6d-90bc-52e5a766206a

📥 Commits

Reviewing files that changed from the base of the PR and between 3a8c858 and b24f88d.

⛔ Files ignored due to path filters (2)

• images/pipecat-logo.svg is excluded by !**/*.svg
• images/telnyx-logo.svg is excluded by !**/*.svg

📒 Files selected for processing (3)

• developer-guide/integrations/pipecat.mdx
• developer-guide/integrations/telnyx.mdx
• docs.json