fix from_ related bug, URL to URI

[snakajima]

Summary by CodeRabbit

• Bug Fix: Updated the software to check for the "NEO4J_URI" environment variable for the Neo4j URL. If not found, it will fall back to "NEO4J_URL", providing a warning message for the user.
• Refactor: Adjusted the "edges" dictionary to use the property name "from" instead of "from_", aligning with the expected property name in the code. This change enhances the consistency of the codebase, improving its maintainability.

[coderabbitai[bot]]

Walkthrough

The changes primarily focus on enhancing the code's robustness and consistency. The environment variable for the Neo4j URL is updated, and a fallback mechanism is introduced. Additionally, a property name in the 'edges' dictionary is corrected to match the expected name, improving the code's readability and maintainability.

Changes

File	Summary
main.py	The code now checks for the "NEO4J_URI" environment variable for the Neo4j URL. If not found, it falls back to "NEO4JURL" and issues a warning. The 'from' property in the 'edges' dictionary is renamed to 'from'.
models.py	The Edge class has been updated. The from_ attribute is renamed to from using the alias parameter in the Field declaration, as 'from' is a reserved keyword in Python.

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