[openstreetmap-website] Move copyright link to attribution control (#423)

[Rob Norris]

I fully agree with other commentators - have both.
Keep the sidebar link, albeit probably slightly better under the 'Data' heading.
Add the new in map attribution as a 'standard' way to do it.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/423#issuecomment-22222611
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