[ImgBot] Optimize images (#5913)

*Total -- 2,264.72kb -> 2,093.92kb (7.54%)

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/public/img/emoji/back.png -- 3.97kb -> 2.46kb (37.95%)
/public/img/gogs-large-resize.png -- 80.67kb -> 54.16kb (32.86%)
/public/plugins/pdfjs-1.4.20/web/images/annotation-note.svg -- 1.02kb -> 0.69kb (32.08%)
/public/img/404.png -- 8.43kb -> 5.94kb (29.47%)
/public/img/500.png -- 9.76kb -> 7.27kb (25.47%)
/public/img/favicon.png -- 28.47kb -> 21.58kb (24.21%)
/public/plugins/pdfjs-1.4.20/web/images/annotation-check.svg -- 0.41kb -> 0.31kb (23.37%)
/public/plugins/pdfjs-1.4.20/web/images/annotation-newparagraph.svg -- 0.42kb -> 0.32kb (23%)
/public/img/gogs.svg -- 14.66kb -> 11.34kb (22.66%)
/public/plugins/pdfjs-1.4.20/web/images/annotation-insert.svg -- 0.40kb -> 0.31kb (22.55%)
/public/img/gogs-lg.png -- 164.32kb -> 133.07kb (19.02%)
/public/img/dingtalk.png -- 30.02kb -> 24.91kb (17.02%)
/public/plugins/pdfjs-1.4.20/web/images/annotation-comment.svg -- 0.86kb -> 0.74kb (14.72%)
/public/img/avatar_default.png -- 502.04kb -> 442.97kb (11.77%)
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/public/assets/octicons-4.3.0/octicons.svg -- 43.89kb -> 41.59kb (5.23%)
/public/img/emoji/envelope.png -- 1.62kb -> 1.53kb (5.08%)
/public/css/themes/default/assets/fonts/icons.svg -- 381.68kb -> 369.58kb (3.17%)
/public/css/themes/default/assets/fonts/outline-icons.svg -- 104.69kb -> 101.59kb (2.96%)
/public/css/themes/default/assets/fonts/brand-icons.svg -- 495.73kb -> 487.61kb (1.64%)
/public/img/emoji/page_facing_up.png -- 2.13kb -> 2.09kb (1.56%)
/public/assets/font-awesome-4.6.3/fonts/fontawesome-webfont.svg -- 382.44kb -> 377.43kb (1.31%)

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

Co-authored-by: Imgbot <help@imgbot.net>

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public/plugins/pdfjs-1.4.20/web/images/annotation-key.svg

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