[Improvement] Implement Dropdown for Mode Switching between Generate Q&A and Ask Questions

[yatikakain]

Fixed Issue #54

This PR introduces a dropdown menu for mode switching between Generate Q&A and Ask Questions of the EduAid application. The dropdown provides a user-friendly interface to toggle between different modes, replacing the previous switch component.

Key Changes:

• Replaced the switch component with a dropdown menu for better user experience and clarity.
• Updated Home.jsx to incorporate the dropdown menu for selecting the mode.
• Similarly updated Answer.jsx to include the dropdown for mode switching.
• Handled redirection and state changes when a different mode is selected through the dropdown.
• Refined UI components for a seamless experience while toggling modes.
• Ensured consistent design and functionality across the application.

Additionally, updated the .gitignore file to stop tracking the dependencies folder (including the venv folder and other dependencies).