resolve some bug issues and code smell

assets/css/custom.css

assets/js/__test__/CreateVacancy-test.jsx

assets/js/__test__/components/ApproveModal-test.jsx

assets/js/__test__/components/Pagination-test.jsx

assets/js/__test__/components/VerifyAdminModal-test.jsx

assets/js/components/AdminVacancy.jsx

assets/js/components/CourseList.jsx

assets/js/components/InfoModal.jsx

assets/js/components/Pagination.jsx

core/css/custom.css

core/views/accounts.py