[openstreetmap/openstreetmap-website] Add some javascript to check dynamically if the username is already taken (PR #4402)

[Holger Jeromin]

> How is it actually checking? I can't actually see it constructing any sort of URL in that code?

The code is running on the URL `https://www.openstreetmap.org/user/new` so fetching 
`fetch("./" + chosenUsername)` will result in checking `https://www.openstreetmap.org/user/<username>` which results in http 200 or 404

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