update AppHeader.tsx to show links based on user role.
update sign up pages to send the correct backend information.
update DiscussionPopupForm.tsx to use LabContext (less repetative code).

update css for labs filtering
clean up code (use contexts/services more)

edit utils.ts
add CollegeContext to main

edited types.ts
add signupapi to utils.ts
add key to labslistitem

remove unnecesary props
create context for login and discussions

create services
update signup student to select major

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