Layout and minor color changes
Displaying username in navigation bar
Document preview implemented
Refactoring
Token management implemented, redirections
Renamed files, fixed overflow in annotation view, added access to the AnnotationContext in annotation view, deleted visiblity from add document modal window, deleted LayoutProps
Refactored directory structure
Refactored directory structure and changed structure of layouts of the annotation screen
Created a layout of the annotation screen
Created a layout with empty panels. They will be done in other branches.