Function disconnect

disconnect(graph, from, to): DirectedGraph
Returns a mutation of graph, with a given edge removed.

If edge was not there, original graph is returned.
Parameters
- graph: Readonly<{
      vertices: IMapImmutable<string, Readonly<{
          id: string;
          out: readonly Readonly<{
              id: string;
              weight?: number;
          }>[];
      }>>;
  }>
- from: string | Readonly<{
      id: string;
      out: readonly Readonly<{
          id: string;
          weight?: number;
      }>[];
  }>
- to: string | Readonly<{
      id: string;
      out: readonly Readonly<{
          id: string;
          weight?: number;
      }>[];
  }>
Returns DirectedGraph