Adding an archived version of chat_app

[elviskahoro]

This pull request introduces a new chat application built with Reflex. Here are the key changes:

1. Added a GitHub Actions workflow for repository dispatch on push to main branch.
2. Implemented a chat interface with OpenAI integration.
3. Created components for chat messages, action bar, loading icon, and navbar.
4. Added state management for handling chat sessions, questions, and answers.
5. Implemented modal and sidebar components for creating and managing chat sessions.
6. Added styling and theming using Reflex's Chakra UI integration.
7. Included error handling for missing OpenAI API key.
8. Added README with setup instructions and feature overview.
9. Included LICENSE file (MIT License).
10. Added configuration files for Reflex and project dependencies.

This chat application demonstrates the use of Reflex for building a full-stack Python web app with real-time LLM integration.

[elviskahoro]

• Adding an archived version of chat_app #265 👈
• main

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