Broken image reference in the plugins directory

[simonw]

https://datasette.io/plugins/datasette-geojson-map

That's a an image reference to this URL, which is a 404: https://datasette.io/plugins/img/boston-neighborhoods-map.png

Ideally that would be rewritten to link here instead:

https://raw.githubusercontent.com/eyeseast/datasette-geojson-map/main/img/boston-neighborhoods-map.png