Improve UI based on customer feedback(21/4-23) and add help-button to the 'Add ingredients to Fridge' view

Hs add javadoc to food controllers

See merge request !46

HS - add budget bars dynamically with scroller

See merge request !44

Merging frontend-testing into master

See merge request !43

# Conflicts:
#	src/main/java/no/ntnu/idatt1002/demo/controller/BudgetController.java
#	src/main/java/no/ntnu/idatt1002/demo/controller/FinanceController.java
#	src/main/java/no/ntnu/idatt1002/demo/controller/IncomeExpenseController.java
#	src/main/java/no/ntnu/idatt1002/demo/controller/MainMenu.java
#	src/main/java/no/ntnu/idatt1002/demo/controller/SceneController.java
#	src/main/java/no/ntnu/idatt1002/demo/data/Budget/GeneralBudget.java
#	src/main/resources/Budget/Budget.budget
#	src/main/resources/Economics/Expense.register
#	src/main/resources/Economics/Income.register
#	src/main/resources/view/BudgetNewest.fxml
#	src/main/resources/view/IncomeAndExpenses.fxml
#	src/main/resources/view/MainMenuNew.fxml
#	src/main/resources/view/dualList.fxml
#	src/main/resources/view/newBudgetBudgert.fxml
#	src/test/java/no/ntnu/idatt1002/demo/data/Budget/GeneralBudgetTest.java

Hs frontend recipes

See merge request !42

# Conflicts:
#   src/main/resources/Economics/Income.register

Implemented new button to distinguish button that returns to main menu, and button that returns to start