Improve WorkflowInstance visualization

[FyreByrd]

The /workflow-instances/[product_id] route currently uses a physics simulation to optimize the graph layout for the visualization of a WorkflowInstances. There is probably a more performant way to do this.

[FyreByrd]

Original comment from $lib/springyGraph.ts

// Using a physics simulation for our graph is overkill and slow. Redoing this would be optimal.