Update readme and env examples

[AHGIJMKLKKZNPJKQR]

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[linear]

FCE-2812 Update deep sea stories readme

[Copilot]

Pull request overview

This pull request removes the ElevenLabs dependency and adds comprehensive documentation for the Deep Sea Stories project. The changes replace ElevenLabs with Google Gemini for AI functionality and provide clear setup instructions for both Docker Compose and manual deployment.

Changes:

• Removed ElevenLabs SDK dependency and all related configuration (API key, package references)
• Added detailed README with setup instructions, requirements, and architecture overview
• Updated environment variable examples across all configuration files
• Cleaned up redundant Docker Compose environment configuration for the frontend

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
deep-sea-stories/yarn.lock	Removed ElevenLabs package and its transitive dependencies (command-exists, node-fetch@2.7.0, tr46, webidl-conversions, whatwg-url)
deep-sea-stories/packages/backend/tests/config.test.ts	Removed test assertions for ELEVENLABS_API_KEY requirement
deep-sea-stories/packages/backend/src/config.ts	Removed ELEVENLABS_API_KEY from config schema
deep-sea-stories/packages/backend/package.json	Removed @elevenlabs/elevenlabs-js dependency
deep-sea-stories/packages/backend/.env.example	Removed ELEVENLABS_API_KEY from example environment file
deep-sea-stories/docker-compose.yml	Removed ELEVENLABS_API_KEY and redundant VITE_BACKEND_URL runtime environment variable
deep-sea-stories/README.md	Added comprehensive documentation including setup instructions, requirements, and project structure
deep-sea-stories/.env.example	Replaced ELEVENLABS_API_KEY with GEMINI_API_KEY

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