This commit updates the start script in package.json to use the 'cross-env' package to set the 'HTTPS' environment variable. This change addresses the issue where running 'npm start' resulted in a 'cross-env' command not recognized error for windows.

- Updated the 'start' script in package.json
- Replaced 'HTTPS=true react-scripts start' with 'cross-env HTTPS=true react-scripts --openssl-legacy-provider start'
- Resolved the 'cross-env' command not recognized error for Windows

… improve code organization and maintainability. The changes include:

- Rearranging files into logical directories based on their functionality and purpose.
- Updating import paths and references to reflect the new directory structure.

These changes aim to enhance code clarity, separation of concerns, and ease of maintenance.

- Upgraded React version from 16.14.0 to 17.0.0
- Added unit tests for various components
- Added components documentation to provide better clarity and understanding of the codebase.
- Updated the developer guide

- Upgraded Material-UI (MUI) from version 4 to version 5 and 2 other dependancies