revert to using Plotly.newPlot , see changelog

• the HTMX swap mechanism works once more as expected: this extension now receives an object from the server, which
  is unpacked into Plotly restyle data and HTML markup.

Breaking:

• htmx-plotly now operates on arrays of Plotly JSON objects (== one per trace: https://plotly.com/javascript/plotlyjs-function-reference/#plotlyrestyle

In restyle, arrays are assumed to be used in conjunction with the trace indices provided. Therefore, to apply an array as a value, you need to wrap it in an additional array.

TODO:

• verify that this works for plots with multiple traces