[ImgBot] Optimize images (#110)

*Total -- 945.38kb -> 813.31kb (13.97%)

/packages/iridium/components/shared/test_resources/util/archive/epub/EPUB/images/cover.png -- 40.17kb -> 15.47kb (61.49%)
/packages/iridium/reader_widget/assets/images/app-icon.png -- 23.30kb -> 9.75kb (58.18%)
/packages/iridium/reader_widget/example/web/icons/Icon-maskable-512.png -- 20.51kb -> 10.54kb (48.61%)
/packages/iridium/reader_widget/assets/images/cover.png -- 7.83kb -> 4.75kb (39.35%)
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/packages/iridium/components/navigator/assets/xpub-assets/bookmark.svg -- 0.57kb -> 0.42kb (25.3%)
/packages/iridium/reader_widget/assets/images/icon_menu.png -- 1.87kb -> 1.43kb (23.38%)
/packages/iridium/reader_widget/assets/images/app-play-feature-image.png -- 40.76kb -> 31.35kb (23.09%)
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/packages/iridium/reader_widget/assets/images/icon_audio.png -- 0.84kb -> 0.68kb (19.47%)
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/packages/iridium/reader_widget/assets/images/icon_decrease.png -- 1.63kb -> 1.40kb (13.75%)
/packages/iridium/reader_widget/assets/images/icon_plus.png -- 1.29kb -> 1.16kb (10.2%)
/packages/iridium/reader_widget/assets/images/icon_minus.png -- 1.19kb -> 1.10kb (7.41%)
/ss/desktop_1.png -- 479.68kb -> 444.31kb (7.37%)
/packages/iridium/reader_widget/assets/images/icon_left.png -- 1.78kb -> 1.66kb (6.7%)
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/packages/iridium/reader_widget/assets/images/cnl.png -- 19.82kb -> 19.04kb (3.96%)
/packages/iridium/components/shared/test_resources/publication/services/cover.jpg -- 67.89kb -> 66.56kb (1.96%)
/packages/iridium/reader_widget/assets/images/icon_justify.png -- 1.59kb -> 1.56kb (1.96%)
/packages/iridium/reader_widget/assets/images/icon_left_white.png -- 0.79kb -> 0.77kb (1.37%)

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