[ImgBot] Optimize images

*Total -- 970.05kb -> 157.61kb (83.75%)

/images/block_icon/hardware_bzr2.svg -- 247.28kb -> 0.91kb (99.63%)
/images/block_icon/hardware_dc.svg -- 248.25kb -> 1.61kb (99.35%)
/images/block_icon/hardware_led.svg -- 249.30kb -> 1.90kb (99.24%)
/images/hw/iCOBOT_Front.png -- 174.26kb -> 105.80kb (39.28%)
/images/beta_tag.svg -- 0.43kb -> 0.34kb (20.67%)
/images/hardware/KKMOO.png -- 50.53kb -> 47.05kb (6.89%)

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

Author: ImgBotApp