User profile page

[JuhoBjn]

• [x] Display shortened info if profile is not own
  • [x] Profile picture
  • [x] Name
  • [x] Profile bio
  • [x] City
  • [x] Button to send friend request ?
• [x] Show full info on user's own profile
  • [x] Button to upgrade to premium if user doesn't have premium
• [x] ~Feature to edit user details~ (implement as separate issue)
• [x] Tests with Vitest and Cypress