Refactor/models gdrive integration

[Avdhesh-Varshney]

• Title: Refactoring model files and updating documentation
• Your Name: Avdhesh Varshney

Checklist: ☑️

• My code follows the Contributing Guidelines & Code of Conduct of this project.
• This PR does not contain plagiarized content.
• I have performed a self-review of my own code.
• I have commented my code, particularly wherever it was hard to understand.
• My changes generate no new warnings.

Screenshots 📷

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