Fix backend env loading and improve homepage text

[Asmitha7intech]

Summary

This PR includes improvements to both backend configuration and frontend UI.

Backend Changes

• Fixed environment variable loading using pydantic-settings
• Added support for .env file to ensure proper local configuration
• Prevents runtime validation errors due to missing environment variables

Frontend Changes

• Improved landing page hero section text and layout
• Enhanced clarity and readability for users

Why this matters

• Backend fix ensures smoother setup for new contributors
• Frontend improvement enhances first-time user experience