[ImgBot] Optimize images

*Total -- 538.55kb -> 433.50kb (19.51%)

/Data-Visualization/WaterfallChart/WaterFall.png -- 30.35kb -> 5.99kb (80.25%)
/Data-Visualization/FunnelChart/FunnelChart.png -- 41.78kb -> 19.86kb (52.46%)
/Data-Visualization/TernaryPlots/ternaryplot.png -- 64.96kb -> 36.28kb (44.15%)
/Data-Visualization/Contour Plots/contourplot.png -- 84.59kb -> 58.90kb (30.37%)
/Fast Algorithm (Corner Detection)/Output.png -- 316.87kb -> 312.46kb (1.39%)

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

Author: ImgBotApp