[openstreetmap/openstreetmap-website] Add 404.png used by sites using old OpenLayers example (#2728)

[Grant]

8 million requests a day / 100 requests a second (>32 million fd stats and >16 million fs reads) does cost and is not insignificant. We already have legacy OpenLayers files in this repo, adding 1 static file will mostly get rid of the OpenLayers DDOS failure request loop that has been hitting us for years.

Would you prefer the 404.png file was dropped by chef?

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