[ImgBot] Optimize images

*Total -- 1,998.35kb -> 1,827.51kb (8.55%)

/tools/Documentation/.screenshots/utf8-region.png -- 17.69kb -> 13.01kb (26.44%)
/tools/Documentation/.screenshots/utf8-popup.png -- 8.96kb -> 6.90kb (22.98%)
/tools/Documentation/.screenshots/utf8-restart.png -- 7.30kb -> 5.73kb (21.51%)
/tools/Documentation/.screenshots/karen-dark.png -- 640.46kb -> 580.56kb (9.35%)
/tools/Documentation/.screenshots/karen.png -- 743.33kb -> 684.24kb (7.95%)
/tools/Documentation/.screenshots/karen-light.png -- 572.07kb -> 528.62kb (7.59%)
/tools/Documentation/.screenshots/karen-startmenu.png -- 8.54kb -> 8.43kb (1.2%)

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

Author: ImgBotApp