Add initial project structure for Small, a clean frontend for reading Medium articles. This setup includes:
- Basic Flask app configuration with necessary dependencies.
- RESTful endpoint to fetch and serve Medium articles.
- Templates and static assets for the user interface.
- Utility functions for parsing Medium article IDs.
- Custom error pages (404 and 500) for nicer error handling.
- Project metadata files such as .gitignore, README, LICENSE, and pyproject.toml for project setup and documentation.
This structure sets the foundation for further development and feature additions.
