[ImgBot] Optimize images

*Total -- 6,120.80kb -> 5,995.75kb (2.04%)

/src/img/logo/S-logo.svg -- 1.74kb -> 1.47kb (15.51%)
/src/img/site/schulze-uebersetzungen/letters@1.00x.png -- 2,929.18kb -> 2,854.80kb (2.54%)
/src/img/site/schulze-uebersetzungen/letters@0.75x.png -- 1,798.75kb -> 1,764.89kb (1.88%)
/src/img/site/schulze-uebersetzungen/letters@0.50x.png -- 845.93kb -> 834.61kb (1.34%)
/src/img/site/schulze-uebersetzungen/letters@0.25x.png -- 226.39kb -> 224.10kb (1.01%)
/src/img/site/schulze-uebersetzungen/letters@0.30x.png -- 318.81kb -> 315.88kb (0.92%)

Signed-off-by: ImgBotApp <ImgBotHelp@gmail.com>

src/img/logo/S-logo.svg

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