[ImgBot] Optimize images

*Total -- 9,641.76kb -> 7,140.53kb (25.94%)

/static/images/Results/ham-test-2.png -- 85.79kb -> 57.86kb (32.56%)
/static/images/Results/spam-test-2.png -- 74.67kb -> 50.54kb (32.32%)
/static/MLP-1.gif -- 7,231.22kb -> 4,984.00kb (31.08%)
/static/images/Results/spam-test-1.png -- 110.53kb -> 76.27kb (31%)
/static/images/shehan_logo_1000px.png -- 56.69kb -> 39.76kb (29.86%)
/static/images/Results/ham-test-1.png -- 97.61kb -> 68.52kb (29.8%)
/static/favicon-32x32.png -- 1.47kb -> 1.22kb (16.51%)
/static/images/Spam Detection in Email using Machine Learning.png -- 655.67kb -> 566.69kb (13.57%)
/static/images/about.jpg -- 203.25kb -> 187.85kb (7.58%)
/static/images/testimonial/01.jpg -- 86.26kb -> 82.55kb (4.31%)
/static/images/bg/2.jpg -- 1,038.58kb -> 1,025.27kb (1.28%)

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

Author: ImgBotApp