feat: delete quiz in db

...c/main/java/unipotsdam/gf/interfaces/IPeerAssessment.java

.../modules/assessment/controller/service/FBAssessement.java

...modules/assessment/controller/service/PeerAssessment.java

...es/assessment/controller/service/PeerAssessmentDummy.java

...es/assessment/controller/service/QuizDBCommunication.java

...tsdam/gf/modules/assessment/controller/view/QuizView.java

gemeinsamforschen/src/main/webapp/assets/js/Quiz.js

gemeinsamforschen/src/main/webapp/assets/js/createQuiz.js

gemeinsamforschen/src/main/webapp/assets/js/viewQuiz.js

gemeinsamforschen/src/main/webapp/pages/viewQuiz.jsp