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

[Saman Bemel-Benrud]

Here's a proposal for a cleaner design:

![share-redesign](https://f.cloud.github.com/assets/108094/887554/a900b7f4-f9fd-11e2-8195-4c2360bd3fa1.png)

- Clearly separate the three different share techniques.
- Separate marker visibility from the share sections.
- Add a subtle background to bring emphasis to the link share option and help clarify that the section are not related to each other.
- Use same typography conventions in the image share that we use elsewhere.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/351#issuecomment-21875763
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