docs: optimise PNGs
I used zopflipng with 100 iterations on most of them, and advpng with 300 iterations in zopfli mode on front_page_screenshot.png
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Before Width: | Height: | Size: 6.4 KiB After Width: | Height: | Size: 3.4 KiB |
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Before Width: | Height: | Size: 5.6 KiB After Width: | Height: | Size: 3.0 KiB |
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Before Width: | Height: | Size: 38 KiB After Width: | Height: | Size: 33 KiB |
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Before Width: | Height: | Size: 7.5 KiB After Width: | Height: | Size: 5.0 KiB |
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Before Width: | Height: | Size: 25 KiB After Width: | Height: | Size: 13 KiB |
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Before Width: | Height: | Size: 45 KiB After Width: | Height: | Size: 27 KiB |
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Before Width: | Height: | Size: 72 KiB After Width: | Height: | Size: 43 KiB |
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Before Width: | Height: | Size: 4.1 KiB After Width: | Height: | Size: 3.3 KiB |
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Before Width: | Height: | Size: 4.1 KiB After Width: | Height: | Size: 3.2 KiB |
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Before Width: | Height: | Size: 9.9 KiB After Width: | Height: | Size: 8.9 KiB |
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Before Width: | Height: | Size: 24 KiB After Width: | Height: | Size: 14 KiB |
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Before Width: | Height: | Size: 22 KiB After Width: | Height: | Size: 14 KiB |