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: 146 KiB After Width: | Height: | Size: 144 KiB |
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Before Width: | Height: | Size: 17 KiB After Width: | Height: | Size: 16 KiB |
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Before Width: | Height: | Size: 37 KiB After Width: | Height: | Size: 36 KiB |
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Before Width: | Height: | Size: 19 KiB After Width: | Height: | Size: 11 KiB |
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Before Width: | Height: | Size: 17 KiB After Width: | Height: | Size: 16 KiB |
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Before Width: | Height: | Size: 186 KiB After Width: | Height: | Size: 38 KiB |
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Before Width: | Height: | Size: 49 KiB After Width: | Height: | Size: 47 KiB |
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Before Width: | Height: | Size: 66 KiB After Width: | Height: | Size: 44 KiB |