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

[Grant]

Add a message in the old OpenLayer 404.png
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2728

-- Commit Summary --

  * Add 404.png used by sites using old OpenLayers example

-- File Changes --

    A vendor/assets/openlayers/img/404.png (0)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2728.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2728.diff

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