[ImgBot] Optimize images

*Total -- 304.20kb -> 225.80kb (25.77%)

/AltCover.Visualizer/wiki/FontSelection.png -- 4.29kb -> 2.74kb (36.29%)
/AltCover.Visualizer/wiki/Annotation66a.png -- 87.89kb -> 58.00kb (34.01%)
/AltCover.Visualizer/wiki/Annotation66b.png -- 70.08kb -> 50.09kb (28.53%)
/AltCover.Visualizer/wiki/Annotated.png -- 141.93kb -> 114.98kb (18.99%)

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

Author: ImgBotApp