Center graph to one node

I'd like to create a new graph centered at one specific node. How can I tell vivagraphjs to create the new graph keeping it centered to one specific node? If this is not possible, how can I detect when the graph has finished rendered so I can call `.moveTo`?

Start by reviewing how VivaGraphJS creates and renders a graph, then inspect the existing `.moveTo` API and its rendering lifecycle. Done means documenting or exposing a reliable way to center a graph on one node, or to detect when rendering has finished before calling `.moveTo`.

Written by the indexing model from the issue text.