[ImgBot] Optimize images
*Total -- 552.99kb -> 416.48kb (24.69%)
/docs/assets/play/ic_launcher_APP.png -- 44.14kb -> 23.10kb (47.68%)
/docs/assets/xxxhdpi/ic_launcher_APP.png -- 15.50kb -> 8.17kb (47.3%)
/docs/assets/xxhdpi/ic_launcher_APP.png -- 11.40kb -> 6.20kb (45.65%)
/docs/assets/xhdpi/ic_launcher_APP.png -- 7.35kb -> 4.23kb (42.49%)
/docs/assets/hdpi/ic_launcher_APP.png -- 5.41kb -> 3.25kb (40.05%)
/docs/assets/mdpi/ic_launcher_APP.png -- 3.44kb -> 2.32kb (32.75%)
/docs/images/image001.png -- 196.27kb -> 149.79kb (23.69%)
/docs/examples/images/Figure_2.png -- 53.46kb -> 42.70kb (20.13%)
/docs/examples/images/Figure_4.png -- 94.97kb -> 76.86kb (19.07%)
/docs/examples/images/Figure_3.png -- 64.04kb -> 52.03kb (18.75%)
/docs/examples/images/Figure_1.png -- 57.01kb -> 47.86kb (16.04%)
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