[ImgBot] Optimize images

*Total -- 809.17kb -> 592.66kb (26.76%)

/07. Cash Calculator Application/Screen Shot.png -- 412.54kb -> 277.19kb (32.81%)
/05. Poll System Application/Screen Shot.png -- 42.77kb -> 29.43kb (31.19%)
/04. Encryption Application/Screen Shot.png -- 33.99kb -> 24.69kb (27.38%)
/03. Calculator Application/Screen Shot.png -- 39.86kb -> 29.92kb (24.93%)
/04. Encryption Application/assets/favicon.png -- 0.93kb -> 0.72kb (23.17%)
/01. Stopwatch Timer Application/Screen Shot.png -- 66.29kb -> 51.11kb (22.9%)
/02. Vowel Counter Application/Screen Shot.png -- 25.31kb -> 20.11kb (20.55%)
/06. Password Generator Application/Screen Shot.png -- 126.65kb -> 104.20kb (17.73%)
/07. Cash Calculator Application/assets/images/two_note.png -- 5.88kb -> 5.29kb (10%)
/07. Cash Calculator Application/assets/images/one_note.png -- 5.94kb -> 5.37kb (9.56%)
/07. Cash Calculator Application/assets/images/five_note.png -- 5.30kb -> 4.80kb (9.42%)
/07. Cash Calculator Application/assets/images/two_hundred_note.png -- 5.94kb -> 5.38kb (9.36%)
/07. Cash Calculator Application/assets/images/one_hundred.png -- 6.08kb -> 5.52kb (9.19%)
/07. Cash Calculator Application/assets/images/fifty_note.png -- 6.08kb -> 5.53kb (9.15%)
/07. Cash Calculator Application/assets/images/two_thousand_note.png -- 6.15kb -> 5.60kb (8.97%)
/07. Cash Calculator Application/assets/images/twenty_note.png -- 5.67kb -> 5.17kb (8.83%)
/07. Cash Calculator Application/assets/images/ten_note.png -- 5.64kb -> 5.15kb (8.72%)
/07. Cash Calculator Application/assets/images/five_hundred_note.png -- 5.99kb -> 5.50kb (8.21%)
/02. Vowel Counter Application/assets/favicon.png -- 2.15kb -> 1.99kb (7.76%)

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