Fixed a few mistakes.
Changed the JSON_objects_for_tests/student_data_from_susi_list_of_faculty_numbers.txt ( list of majors for the student )
fixed 'surname' to 'second_name'
JSON_objects_for_tests/student_data_payments.txt: fixed structure
FrontEnd first installment
Some moving of front end files.
Navbar changes
Profile page updates
Added login.html page
Change menu style
Added payment page.
Edit mode
student_info.php: implemented getStudentInfo()
api.php: getStudentInfo() implementation