[ImgBot] Optimize images

*Total -- 457.05kb -> 272.66kb (40.34%)

/wire-frames.png -- 42.97kb -> 13.60kb (68.35%)
/Nora.png -- 375.74kb -> 229.55kb (38.91%)
/cake.png -- 14.47kb -> 10.81kb (25.24%)
/wireframe.png -- 7.30kb -> 5.63kb (22.86%)
/muffin.png -- 16.58kb -> 13.06kb (21.21%)

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

Author: ImgBotApp