[openstreetmap-website] Reorganize export/share UI (#351)

[John Firebaugh]

Yes, this ability was removed from the UI for the HTML embed. It was present in earlier revisions of this pull request and available for long/short link too, but it actually only worked with long link. I think that having a compact UI and simple, consistent options for embed, short, and long links is worth it. The behavior is also intended to address the complaints about not being able to easily create a centered marker at a precise location. Folks that need embed code with an off-center marker are still able to copy, paste, and tweak by hand.

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https://github.com/openstreetmap/openstreetmap-website/pull/351#issuecomment-22118702
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