Feature request: Option to put x axis on the top

[mroswell]

A user submitted this request:

For https://disinfectants.saferortoxic.org/disinfectants/listN?_facet=Safer_or_Toxic#g.mark=bar&g.x_column=Safer_or_Toxic&g.x_type=ordinal&g.y_column=Company&g.y_type=ordinaI
Is there any way to put the x axis on the top instead of the bottom because you have to scroll a while before you understand which side is safer and which side is toxic.

[mroswell]

Issue #35 remains quirky, sometimes the chart shows in the vega editor, and sometimes it doesn't. But at one point I was able to open the chart in the vega editor.

Changing the config tab excerpt from:

  "axisX": {"grid": true, "tickSize": 10},

to:

  "axisX": {"grid": true, "tickSize": 10, "orient":"top"},

Put the label on the top.

This is a good clue, in any case, for anyone who is able to take this further, and actually modify datasette-vega to default to that.

Especially useful when a chart is a long scroll down.

(This could be tricky to apply, because swapping the orientation to top really is only useful for long vertical charts.)