[openstreetmap-website] Mild rejig of the browse pages (#487)

[John Firebaugh]

:+1: I like these changes, and I think they will fit well with future sidebar changes. I have a few code review type comments which I'll do line by line, but overall I think this looks good.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/487#issuecomment-25105833
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