[openstreetmap/openstreetmap-website] Add Wiki link to header (#3086)

[Andy Allan]

I'm going to close this PR since I've also closed the original issue. 

Just to help you with future PRs, I'll mention a couple of things that I noticed:

* This PR removed the Export link, without providing a replacement or explanation. I'm not sure if that was intended?
* The PR contains too many 'fixup' commits. In general PRs can contain multiple commits (and I prefer if they do) but each commit should be a logical group of work, rather than a blow-by-blow record of winning the battle with rubocop :-) My recommendation is to use a combination of `git rebase -i` (the 'fixup' option is great for combining such fixup commits into the original commit, and I use this every week)  and then force-push the branch to update the PR with your preferred list of commits.

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