[ImgBot] Optimize images

*Total -- 4,101.42kb -> 3,960.70kb (3.43%)

/scr/scr-0.2.1.png -- 381.88kb -> 348.90kb (8.64%)
/scr/scr-0.3.png -- 311.24kb -> 292.10kb (6.15%)
/scr/scr-0.5.png -- 234.35kb -> 222.37kb (5.11%)
/scr/scr-0.4.png -- 534.52kb -> 514.17kb (3.81%)
/gallery/dock/scr.png -- 690.51kb -> 666.23kb (3.52%)
/scr/scr-0.4.1.png -- 727.91kb -> 707.86kb (2.75%)
/scr/scr-0.4.2.png -- 986.90kb -> 976.49kb (1.05%)
/scr/scr-newest.png -- 234.12kb -> 232.59kb (0.65%)

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

Author: ImgBotApp