[ImgBot] Optimize images

*Total -- 944.99kb -> 633.05kb (33.01%)

/7 Generic program/Output 1.png -- 107.98kb -> 54.74kb (49.3%)
/6 Exception Handling/Ouput 1.png -- 118.07kb -> 61.12kb (48.24%)
/9 Bank Application/Output 1.png -- 203.32kb -> 106.48kb (47.63%)
/8 File Handling/Output 2.png -- 146.57kb -> 76.80kb (47.6%)
/11 Strategy Design pattern/Output 1.png -- 146.25kb -> 127.19kb (13.03%)
/10 Factory design pattern/Output 1.png -- 107.71kb -> 94.51kb (12.25%)
/9 Bank Application/Output 3.png -- 100.75kb -> 98.14kb (2.58%)
/1 Command line argument/Output 1.png -- 14.36kb -> 14.07kb (2.05%)

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

Author: ImgBotApp