Board Browsing View Should Indicate Number of Elements Rather Than Number of Cards#418

Since users are now able to not only place cards but also boards and web links onto the canvas, the boards browsing view elements needs to be updated. As of now, the list elements within that view only show how many cards have been placed onto the board.

The element should either display a unified number for all the elements that are part of the board, or a separated list of how many cards, boards, web links are part of the board to provide even more info for the user.