Build a web application to manage tasks and subtasks from a backlog

It is a project to create an application that allows you to create new kanban boards and tasks and subtasks for each step between the backlog and completion. Must be programmed in PHP 8, TWIG, Bootstrap 5, MYSQL (PHPMyAdmin), JAVASCRIPT and JQUERY (must not use web templates with any type of copyright). Must have best practices to prevent XSS attack. It would be a dynamic website (PHP running on the web server - php files and html files in different folders) and Responsive for different screen sizes and tablets. More instructions and functionality are specified and detailed in the attached files.