[openstreetmap/openstreetmap-website] add banner for SotM 2021 (#3229)

[Martin Raifer]

@tyrasd pushed 1 commit.

6b73edc4156e4afb58787162c22968f70b64277a  add banner for SotM 2021


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/3229/files/e8b4d53ff958ec2043dba2637c5c030f09888088..6b73edc4156e4afb58787162c22968f70b64277a
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