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

[Sarah Hoffmann]

There is still a glitch with "Set custom dimensions" and map movement: select and then unselect "set custom dimensions". Move map view somewhere else. Choose custom dimensions again and map will jump back to previous view.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/351#issuecomment-21899613
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