[ImgBot] Optimize images

*Total -- 11,013.14kb -> 10,636.63kb (3.42%)

/code/viewer/loading.gif -- 1.88kb -> 1.19kb (36.54%)
/code/viewer/image.jpg -- 3,400.83kb -> 3,240.42kb (4.72%)
/Project_example/images/4.jpg -- 7,063.92kb -> 6,848.52kb (3.05%)
/Project_example/images/2.jpg -- 546.50kb -> 546.50kb (0%)

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

Author: ImgBotApp