[openstreetmap-website] Facebook share image (#739)

[Paul Norman]

> @tomhughes It still doesn't work. Facebook still displays generic OSM logo istead of the real map. 

It hasn't changed - nor is there any indication that code was written to change it.

> @pnorman Facebook (and others) caches images from website, so a static map service isn't needed

The image file has to come from somewhere. To have it centered on a point, that somewhere needs to be a static map service of some kind that renders a particular bounding box.

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