[openstreetmap/openstreetmap-website] Add Communities page (#3301)

[mmd]

Just posting a screenshot how this looks like so that others don't have to try out your code:

![pr_3301_1](https://user-images.githubusercontent.com/5842757/132578453-0872228d-3cd6-4728-a074-5227263228b2.png)


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