[ImgBot] Optimize images (#1244)

[ImgBot] Optimize images (#1244)

*Total -- 87.23kb -> 32.48kb (62.77%)

/docs/geometry/images/scanning-7.png -- 13.15kb -> 4.73kb (64.02%)
/docs/geometry/images/scanning-6.png -- 12.86kb -> 4.65kb (63.8%)
/docs/geometry/images/scanning-5.png -- 12.58kb -> 4.71kb (62.56%)
/docs/geometry/images/scanning-1.png -- 11.98kb -> 4.50kb (62.47%)
/docs/geometry/images/scanning-4.png -- 12.39kb -> 4.67kb (62.34%)
/docs/geometry/images/scanning-2.png -- 11.97kb -> 4.52kb (62.22%)
/docs/geometry/images/scanning-3.png -- 12.30kb -> 4.70kb (61.81%)