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

[Saman Bemel-Benrud]

I just pushed a change that makes map controls dark. These feel a little more prominent and also match the iD controls nicely. 

We need to add active classes:
- When panels are open, `active` on corresponding button
- When map marker popup is open `active` on marker button (adds extra visual queue for how to add markers

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/351#issuecomment-21809478
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