Optimized imports

src/main/java/NTNU/IDATT1002/controllers/Explore.java

src/main/java/NTNU/IDATT1002/controllers/Login.java

src/main/java/NTNU/IDATT1002/controllers/Search.java

src/main/java/NTNU/IDATT1002/controllers/SignUp.java

src/main/java/NTNU/IDATT1002/controllers/UploadImages.java

src/main/java/NTNU/IDATT1002/controllers/ViewAlbum.java

src/main/java/NTNU/IDATT1002/controllers/ViewPicture.java

src/main/java/NTNU/IDATT1002/repository/ImageRepository.java

src/main/java/NTNU/IDATT1002/service/PdfDocument.java

src/main/java/NTNU/IDATT1002/utils/Authentication.java

src/main/java/NTNU/IDATT1002/utils/MetaDataExtractor.java