chore: remove old data config

[AnujNayak108]

Pull Request

Description

This PR removes the unused live_delay_minutes field from site_forecast_app/models/pvnet/utils.py.
After searching through:

This repo → only found in utils.py, where it was immediately removed from satellite_config.

Config generation repo → not present.

HuggingFace configs → not present in the satellite section or elsewhere.

Therefore, this field is no longer needed and can safely be removed.

Fixes #74

Checklist:

• My code follows OCF's coding style guidelines
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked my code and corrected any misspellings