update LoginPage.tsx with console messages for form submission. when logged in, redirect to homepage and header login changes to logout. logout deletes session storage item token

add utils.ts and update page links to call from it. update vite.config.ts to start frontend dev on 8081

Add logo to header and index.html, add login page HTML/CSS, add placeholder routes for SignUpProfessorPage.tsx and SignUpStudentPage.tsx