Textarea for GeoJSON from overpass turbo & Write help for this version

[rene78]

• Add a textarea, where people can paste their GeoJSON from an overpass turbo query.
• Write help text. Take this older revision of Wikidata extractor as a template.

[rene78]

Working overpass turbo query (click on Export to GeoJSON after Run):

[out:json][timeout:60];
  area[admin_level=8][name="São Paulo"]->.search;
  (rel(area.search)[admin_level=9][wikidata=""];
  );
  out body;
>;
out skel qt;

[rene78]

Working overpass turbo query for Rome:

[out:json][timeout:60];
  area[admin_level=8][name="Roma"]->.search;
  (rel(area.search)[place="quarter"][wikidata=""];
  );
  out body;
>;
out skel qt;