Show pipeline output dynamically

[schmmd]

Presently the pipeline produces a static HTML file after a pipeline run completes.

We could decouple the HTML generation from the underlying pipeline graph data. This way we could use an external tool to view the pipeline graph data and that tool could update in real time. For example, it could highlight stages of the pipeline once they complete (if they have output data).

One wrinkle is that timing data would be hard to add to the pipeline data unless the pipeline updated it's pipeline graph data as it ran.

[schmmd]

@codeviking FYI

[codeviking]

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