Change explorers default kind to scatter

## Request

Change the `explorer`s default `kind` from `line` to `scatter`.

##

A `scatter` point is a good first starting point. A `line` plot is for continuous data. That is what is written in the reference guides.

A line plot also depends on the order/ sort of the data.

So for a lot of data a `line` plot does not work. While a `scatter` plot sort of does. Its friction that the first thing you get is not useful, you have to figure out you need to select something else and then select it.

## Line


## Scatter