buildInitialOrg builds the initial organization of the navigation graph.

ToServeableNode converts a node in the organization into a node that is serveable.

Config for an organization.

Node is a node in the organization graph.

ServeableNode a data structure containing node information for the frontend.

TableGraph the custom graph structure for an organization.

Use priority queue to get the least reachable nodes at a given level It implements the container/heap interface.