[ImgBot] Optimize images

*Total -- 227.62kb -> 204.39kb (10.21%)

/Data Visualization/Histo.png -- 13.61kb -> 6.62kb (51.34%)
/Snake Game (GUI)/game.png -- 5.45kb -> 3.41kb (37.39%)
/Data Visualization/Pie.png -- 20.32kb -> 15.24kb (25%)
/Simple Notepad/simplenotepad.png -- 18.42kb -> 13.81kb (24.98%)
/Data Visualization/Scatter Plotting.jpeg -- 28.32kb -> 26.93kb (4.9%)
/Data Visualization/Bar Plotting.jpeg -- 57.35kb -> 55.27kb (3.62%)
/Data Visualization/Line Plotting.jpeg -- 84.16kb -> 83.10kb (1.26%)

Signed-off-by: ImgBotApp <ImgBotHelp@gmail.com>

Author: ImgBotApp