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Replace Cartesia references
Summary
Updated documentation to replace Cartesia references with more current examples:
Review & Testing Checklist for Human
Notes
This PR was created as requested by Kapil Gowru (@kgowru) via Slack. Initial request was to replace all Cartesia references with OpenRouter. During review, feedback was provided to use Hume for the WebSocket example instead, with an updated screenshot.
Link to Devin run: https://app.devin.ai/sessions/e7748a1e301b4ad2924973f11973c8d4