[ImgBot] Optimize images (#88)

*Total -- 3,701.98kb -> 2,302.01kb (37.82%)

/doc/source/images/choose-renderer-bokeh.png -- 366.63kb -> 201.61kb (45.01%)
/doc/source/images/chooseDatetimeDischarge.png -- 195.63kb -> 108.84kb (44.37%)
/doc/source/images/pixieapp-add-mapbox-token.png -- 606.01kb -> 350.76kb (42.12%)
/doc/source/images/DataVisualizationCreateNotebook.png -- 350.88kb -> 203.77kb (41.93%)
/doc/source/images/selectLineChart.png -- 77.45kb -> 46.51kb (39.94%)
/doc/source/images/Harvey.png -- 1,178.97kb -> 751.77kb (36.24%)
/doc/source/images/selectDataFrameTableIcon.png -- 37.10kb -> 24.51kb (33.92%)
/doc/source/images/map-view-options-add-mapbox-token.png -- 836.75kb -> 571.29kb (31.73%)
/doc/source/images/architecture.png -- 52.56kb -> 42.96kb (18.27%)

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

Co-authored-by: ImgBotApp <ImgBotHelp@gmail.com>

Author: imgbot[bot]