[openstreetmap/openstreetmap-website] Support Open Graph protocol (#2965)

[Andy Allan]

> We also know that it has very difficult to resolve performance and scalability issues which is why we don't offer it.

Can you describe more of the performance and scalability issues here? Elsewhere, I find the stitching-and-cropping-tiles approach works reasonably well. 

For the OG preview images, I would guess that it's only a (comparatively) small amount of traffic. Each preview would involve ~4 tile requests, some CPU to stitch+crop, and the output image could be cached too.

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