[ImgBot] Optimize images

*Total -- 1,547.36kb -> 1,142.38kb (26.17%)

/media/matmul.png -- 259.48kb -> 111.81kb (56.91%)
/media/matmul.svg -- 51.38kb -> 35.07kb (31.75%)
/examples/server/themes/wild/llamapattern.png -- 253.50kb -> 176.55kb (30.36%)
/media/llama0-banner.png -- 141.23kb -> 99.10kb (29.83%)
/media/llama0-logo.png -- 175.72kb -> 138.67kb (21.09%)
/examples/server/themes/buttons-top/buttons_top.png -- 116.94kb -> 97.73kb (16.43%)
/media/llama1-banner.png -- 32.55kb -> 28.51kb (12.4%)
/examples/server/themes/wild/wild.png -- 484.83kb -> 425.67kb (12.2%)
/media/llama1-logo.png -- 31.73kb -> 29.27kb (7.75%)

Signed-off-by: ImgBotApp <[email protected]>

Author: ImgBotApp