🍱 Reduce size of favicons

[sorairolake]

This executes the following commands:

convert ./static/favicon.ico[0] ./static/0.png
convert ./static/favicon.ico[1] ./static/1.png
convert ./static/favicon.ico[2] ./static/2.png
oxipng -o max ./static/*.png
fd . -e png ./static/ | parallel "zopflipng -my {} {}"
icotool -c -o ./static/favicon.ico ./static/0.png ./static/1.png ./static/2.png

The command versions are as follows:

• oxipng: 9.1.3
• zopflipng: 1.0.3
• icotool: 0.32.3

The regenerated files are losslessly compressed from the original files. Although oxipng -Z can also use Zopfli, I used zopflipng because it gives better results. Also, when I ran icotool -l ./static/favicon.ico, I got the following result, so I regenerated favicon.ico.

--icon --index=1 --width=16 --height=16 --bit-depth=32 --palette-size=0
./static/favicon.ico: incorrect total size of bitmap (4392 specified; 4264 real)

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