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

[John Firebaugh]

I had big colored boxes in an initial design of this page, but we eventually opted for something more stripped-down. I don't remember the reason exactly but it may have been concern about running out of colors, or the fact that OSM.org doesn't have a lot of consistent colors and it would add more inconsistency. I do think this page could be a lot more inviting than it is now though.

/cc @samanpwbb

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/728#issuecomment-40625428
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