[openstreetmap-website] Add styling to make the /help page more approachable (#728)

[Tom Hughes]

Personally I think that design might be a bit bold - the general idea is fine but I'm not sure trying to make each tile quite so distinctive works, or is scalable.

What do other people think?

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/728#issuecomment-40570083
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