[openstreetmap/openstreetmap-website] Updated OpenSearch image & attribution + updated Facebook logo. (#2926)

[Antonin Curtit]

Good lord...
Well, that's the image from osm.org.
![image](https://user-images.githubusercontent.com/30950182/97760428-72cfb980-1b03-11eb-9e9f-560d3ce6acf4.png)


The new one comes OR from the 16x16 hosted on osm.org homepage OR from a SVG → PNG (16x16) I've made, initially obtained from OSM Wiki.

_I mean, it's always like this in this repo ? Just 2 lines of simples changes requires an eternity..._ 🙈

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