Build (interactive) karax based frontend for `plotData`

[Vindaar]

Just some brainstorming ahead:

By restructuring the plotData script slightly, we should be able to build an interactive data visualization tool for the InGrid analysis.

On the front end side we show a list / buttons (whatever) to show the available plots (for a start). Then select a single or several plots and show a page with the selected plots shown in plotly.

On the backend side we need to either:

• easiest: create all plots we may show before hand, once they are created, send selected plots to the karax frontend
• harder: listen via websocket to the karax frontend for selected plots. Then, create the plots, extract the JSON from plotly and send it to the frontend, which will create a div for the plotly plot, call newPlot and insert the received JSON.

Potential further improvements:

• allow to set cuts etc. on the data from the karax interface and provide more general plotting capabilities beyond the defined plots (aside from freedom in datasets)

[Vindaar]

Something like Vega (lite) would be perfect for this I imagine...