[ImgBot] Optimize images

*Total -- 446.86kb -> 374.43kb (16.21%)

/python.png -- 36.54kb -> 22.44kb (38.58%)
/wificR.png -- 109.64kb -> 92.32kb (15.79%)
/wifi.png -- 129.00kb -> 109.80kb (14.88%)
/wifi2.png -- 66.29kb -> 57.83kb (12.77%)
/wifiB.png -- 105.39kb -> 92.04kb (12.67%)

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

Author: ImgBotApp