before:
project-student.js --> givefeedback.jsp
now:
project-student.js --> annotation-document.jsp --> givefeedback.jsp

fix: userToken was not written to url during login

html mutates to jsp step by step. first step

page: annotation_document.html
url: http://localhost:8080/pages/annotation_document.html

fix: post request works in /calculate and Grades was exchanged by ArrayList(Grading), whoop uhm.. whoop!