[ImgBot] Optimize images

*Total -- 398.25kb -> 281.98kb (29.2%)

/images/logo.png -- 30.01kb -> 10.66kb (64.48%)
/images/structure.png -- 18.05kb -> 6.63kb (63.28%)
/images/append.png -- 3.29kb -> 2.03kb (38.37%)
/images/logo_full.png -- 126.41kb -> 83.40kb (34.02%)
/images/customization.png -- 30.46kb -> 24.00kb (21.21%)
/images/example.png -- 37.65kb -> 30.07kb (20.14%)
/images/example_app.png -- 94.61kb -> 77.33kb (18.26%)
/images/button_press.gif -- 32.35kb -> 26.62kb (17.72%)
/Example/assets/icon.png -- 1.07kb -> 0.88kb (17.51%)
/images/example_2.png -- 24.36kb -> 20.36kb (16.4%)

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

Author: ImgBotApp