[openstreetmap/openstreetmap-website] Add Wiki Link to Heading (#3041)

[Seth Deegan]

The Wiki is a major resource used by the OSM community. Having a dedicated link to it in the heading would be useful.

Here's a suggested placement:
![image](https://user-images.githubusercontent.com/22477298/103848396-e6dc8f80-5067-11eb-9454-79bdff9bfd24.png)


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