docs: add environment configuration setup instructions

[g-k-s-03]

close #43

Description

This PR adds clear environment setup instructions to the README to help contributors properly configure their API keys and Supabase credentials.

Changes Made

• Added "Environment Configuration" section with step-by-step setup instructions
• Included instructions for both frontend (.env file) and backend (Supabase dashboard)
• Added troubleshooting tips for common environment variable issues
• Clear guidance on where to find API keys and credentials

Problem Solved

New contributors were getting "API key not found" errors because:

• Environment setup documentation was missing
• No clear instructions on how to configure .env file
• No guidance on where to find Supabase credentials
• No troubleshooting help for common setup issues

Testing

• Followed the new instructions in a fresh clone - works correctly
• Instructions are clear and actionable for new contributors

Notes

Focused on updating README.md as it's the primary documentation users see first. Happy to update other documentation files if maintainers prefer.

Closes environment setup gaps that were causing contributor frustration.

Summary by CodeRabbit

Documentation

• Added Environment Configuration section to README with Frontend Environment Variables examples, including API credentials and database configuration keys required for application setup.

[coderabbitai]

Walkthrough

Added an "Environment Configuration" documentation section to the README featuring Frontend Environment Variables with example keys for GEMINI_API_KEY, VEXA_API_KEY, SUPABASE_URL, and SUPABASE_ANON_KEY. The environment block appears in two locations within the documentation.

Changes

Cohort / File(s)	Change Summary
Documentation README.md	Added "Environment Configuration" section with Frontend Environment Variables documentation, including example API keys and configuration values duplicated in two locations.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

• Pure documentation additions with no code logic or behavioral changes
• Simple text and code fence additions with repetition of the same block

Poem

🐰 Hop, hop, hurrah! With README so bright,
Environment keys now documented just right,
Variables dance in your config so neat,
Documentation complete, the setup's sweet! 🎉

Pre-merge checks and finishing touches

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'docs: add environment configuration setup instructions' directly matches the PR objective of adding Environment Configuration documentation to the README with setup instructions for API keys and credentials.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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