[openstreetmap/openstreetmap-website] Fix opensearch icon & update attribution (PR #3479)

[Harry Bond]

> Why change from PNG format to the massively larger ICO format?

Ah, I didn't realise ICO was bigger, I used it because the most suitable icon I could find was [osm.org/favicon.ico](https://www.osm.org/favicon.ico). The image is also bumped up to 48px instead of 16px though, which will result in a bigger file.

I'll try reducing the size 👍

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