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

[David Gumberg]

All measurements in kb.

app/assets/images/RSS.png 0.296  -> 0.295 1%
app/assets/images/about/osm.png 175.086  -> 173.764 1%
app/assets/images/about/sprite.png 9.937 -> 6.123 38%
app/assets/images/about/sprite at 2x.png 22.876 -> 16.485 28%
app/assets/images/aol.png 1.785 -> 1.286 28%
app/assets/images/attribution_example.png 13.678 -> 8.005 41%
app/assets/images/browse/aerodrome.p.16.png 0.377 -> 0.284 24%
app/assets/images/browse/allotments.png 0.168 -> 0.087 48%
app/assets/images/browse/alpinehut.p.16.png 0.565 -> 0.447 21%
app/assets/images/browse/atm2.p.16.png 0.437 -> 0.357 18% 
app/assets/images/browse/bank2.p.16.png 0.41 -> 0.313 24%
app/assets/images/browse/bar.p.16.png 0.484 -> 0.315 35%
app/assets/images/browse/bridge.20.png 0.149 -> 0.075 44%
app/assets/images/browse/bridleway.20.png 0.205 -> 0.114 45%
app/assets/images/browse/brownfield.png 0.169 -> 0.09 47%
app/assets/images/browse/building.png 0.244 -> 0.157 35%

Average reduction of 30%.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/854#issuecomment-65965315
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