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

[Adam Hoyle]

@tomhughes apologies for the delay getting back to this - I've refactored the data stuff in a way that I _think_ is an improvement. At any rate I'm a bit less embarrassed by it now. I'm not sure if `lib` is the right place to put these, but it seems better than `models`. 

I'm still not really sure how to add tests to it, considering how dependent it is on the npm lib / data files, but I'll take a look at the tests that exist already and see if I can find any similar patterns to be inspired by.

Anyway I'd love to get any / all feedback you have (and that applies to anyone else reading this too 👋 )

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