Improve network diagram - fix positioning of the element

[ricmars]

• fix config.json to be more explicit around required values
• added new examples of diagram in storybook
• improve storybook documentation of the parameters
• fix bug with the hardcoded DP - now use the value passed as parameter
• make the node transparent background to see the edges
• make each node max-width of 10rem so that they are perfectly aligned vertically and all have the same width
• links will now be truncated at 9rem if too long
• fix bug where diagram got stale - moved the initialization of the dagre graph inside the getLayoutedElements function
• fix calculation in getLayoutedElements to use the x and y returned by dagre
• no longer hardcode the zoom level - instead use fitView to recalculate the diagram
• use ReactFlowProvider provider