Home Page, Login and register, and user model and validation

[ChawkiMbarki]

Home Page, Login and register, and user model and validation🚀

Description

This pull request introduces several updates, improving the authentication process and enhancing the home page's appearance. Let's dive into the details:

1. Update main.py 🔄: We've refactored the main application file for better performance and maintainability.
2. Add logo placeholder 🖼️: A placeholder for the future logo has been added to improve brand identity.
3. Create general styling 🎨: A base styling sheet ensures a consistent look and feel across the app.
4. Create user model 👤: The user model is now structured effectively to manage user data.
5. Create user validation ✅: User input validation ensures data integrity.
6. Finish user routes and register blueprint 🛣️: User-related routes are complete, and the blueprint is registered for better modularity.
7. Finish Home Page 🏠: The home page design is finalized, providing a welcoming user experience.

These updates lay the groundwork for future features.