On back click, the parent is set to parent of left nodes, that will solve
the right side menu (elements that were in left side, after backward
navigation will be on the right side).
Current level is set to a lower number in order to set the left side menu.
Returns void
onHomeClick
onHomeClick(): void
On home click, the current level is set to 0, and current parent is
set to root node.
Currently display uri Siblings of the node are on the left, children are on the right