Deleted unnecessary files and classes

...no/ntnu/idatt1002/demo/controller/ExpensesController.java

...a/no/ntnu/idatt1002/demo/controller/IncomeController.java

...no/ntnu/idatt1002/demo/controller/MainMenuController.java

src/main/resources/view/AddBudget.fxml

src/main/resources/view/Budget.fxml

src/main/resources/view/BudgetNew.fxml

src/main/resources/view/Income.fxml

src/main/resources/view/MainMenu.fxml

src/main/resources/view/Overview.fxml

src/main/resources/view/deleteBudget.fxml

src/main/resources/view/initialNewBudgetPopUp.fxml

src/main/resources/view/initialOldBudgetPopUp.fxml

src/main/resources/view/underProgress.fxml