[openstreetmap/openstreetmap-website] add banner for Russia-Ukraine war (PR #3521)

[Anton]

![25db0b8f4c62742a343cc32dea85f9be02b1c63b_1920_1080 jpg](https://user-images.githubusercontent.com/518939/161444527-2dfba38d-1fee-4bbd-9214-5dcb482ec82c.jpg)


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