[openstreetmap/openstreetmap-website] Adding banner for 2021-01 community survey (#3062)

[Mikel Maron]

@tomhughes something like this pass muster?

![OSM Foundation Survey (4)](https://user-images.githubusercontent.com/22896/105520495-c7b94100-5ca8-11eb-8d51-8c5a692c2460.png)

let me know if generally ok, and if it needs any tweaks. if 👍  then i can create a fresh PR, or let me know if another way.

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