Integrates soundasleep/html2text library for HTML to text conversion in user grade export.
Applies consistent styling in Excel export, enhancing readability.
Includes email field in exported user details.
Introduces Composer to manage PHP dependencies for the project.
Includes phpoffice/phpspreadsheet as a required library to
facilitate spreadsheet manipulation.
The `.gitignore` file is updated to exclude composer.phar
and the vendor directory, ensuring sensitive data and
unnecessary files are not tracked.
These changes enable more efficient dependency management
and streamline the integration of third-party packages.
