[openstreetmap-website] Losslessly compressed all images using optipng and advpng (#854)

[David Gumberg]

the first few, had small size reductions, I will go through and do the math, but there were many images that I saw had 40% or greater reductions.

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https://github.com/openstreetmap/openstreetmap-website/pull/854#issuecomment-65964196
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