Revamp Data Viz to use Vega

[epugh]

We have a mix mash of visualizations... Does https://echarts.apache.org/examples/en/index.html#chart-type-pie and https://github.com/railsjazz/rails_charts give us something we can grow with?

Ditch our odd D3 visualizations and vega stuff...?

[epugh]

Actually, maybe the answer is to use https://vega.github.io/vega/examples/ ?

[epugh]

#526 was a step in that direction. I think to be "done done" we eliminate the d3 direct use.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Please do advocate for this issue and ideally submit a patch to get the attention of the maintainers!