[ImgBot] Optimize images

*Total -- 5,626.26kb -> 5,063.38kb (10%)

/docs/pics/AdjacencyMap.png -- 625.33kb -> 284.84kb (54.45%)
/docs/pics/interface.png -- 105.50kb -> 65.55kb (37.87%)
/docs/gifs/ShortestPath.gif -- 1,441.83kb -> 1,352.59kb (6.19%)
/docs/gifs/CycleDetection.gif -- 3,453.60kb -> 3,360.41kb (2.7%)

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

Author: ImgBotApp