Upload and retrieve profile pictures via file system with multer

[YaffyTaffy]

• [x] Check if user is using a default pfp image or have uploaded their own.
• [x] If uploading their own, set the name of the file to their memberID + image extension and add image to the pfp-uploads folder.
• [x] If using a default pfp image, get the image name
• [x] Store pfp name in profile relation.
• [x] Get pfp info from database and create the path to the correct image
• [x] display the correct pfp in view/edit profile page
  • [x] In the signed-in nav bar
  • [ ] In the search results
  • [x] In chats
• [x] In edit profile, be able to change and update the pfp