[openstreetmap/openstreetmap-website] Prompt new visitors to contribute (#3090)

[Tucker Chapman]

The regular box that shows for anonymous users has some prompts for users to contribute. The screenshot above has the temporary OSM Survey banner.

![image](https://user-images.githubusercontent.com/4624530/107816975-7a7a3d80-6d43-11eb-93a8-86b314587a0b.png)


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