[ImgBot] Optimize images (#5913)

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

/public/plugins/pdfjs-1.4.20/web/images/annotation-noicon.svg -- 0.15kb -> 0.08kb (46.84%)
/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%)
/public/img/emoji/black_circle.png -- 2.31kb -> 2.07kb (10.68%)
/public/plugins/pdfjs-1.4.20/web/images/annotation-paragraph.svg -- 1.12kb -> 1.00kb (10.15%)
/public/plugins/pdfjs-1.4.20/web/images/annotation-help.svg -- 2.12kb -> 1.96kb (7.29%)
/public/plugins/pdfjs-1.4.20/web/images/annotation-key.svg -- 1.42kb -> 1.32kb (6.68%)
/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>

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

@@ -1,11 +1 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg
-   xmlns="http://www.w3.org/2000/svg"
-   width="40"
-   height="40"
-   viewBox="0 0 40 40">
-  <path
-     d="M 1.5006714,23.536225 6.8925879,18.994244 14.585721,26.037937 34.019683,4.5410479 38.499329,9.2235032 14.585721,35.458952 z"
-     id="path4"
-     style="fill:#ffff00;fill-opacity:1;stroke:#000000;stroke-width:1.25402856;stroke-opacity:1" />
-</svg>
+<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="0 0 40 40"><path id="path4" fill="#ff0" fill-opacity="1" stroke="#000" stroke-opacity="1" stroke-width="1.254" d="M 1.5006714,23.536225 6.8925879,18.994244 14.585721,26.037937 34.019683,4.5410479 38.499329,9.2235032 14.585721,35.458952 z"/></svg>

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

@@ -1,10 +1 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg
-   xmlns="http://www.w3.org/2000/svg"
-   width="64"
-   height="64"
-   viewBox="0 0 64 64">
-  <path
-     d="M 32.003143,1.4044602 57.432701,62.632577 6.5672991,62.627924 z"
-     style="fill:#ffff00;fill-opacity:0.94117647;fill-rule:nonzero;stroke:#000000;stroke-width:1.00493038;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none" />
-</svg>
+<svg xmlns="http://www.w3.org/2000/svg" width="64" height="64" viewBox="0 0 64 64"><path fill="#ff0" fill-opacity=".941" fill-rule="nonzero" stroke="#000" stroke-dasharray="none" stroke-miterlimit="4" stroke-opacity="1" stroke-width="1.005" d="M 32.003143,1.4044602 57.432701,62.632577 6.5672991,62.627924 z"/></svg>

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

@@ -1,11 +1 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg
-   xmlns="http://www.w3.org/2000/svg"
-   width="64"
-   height="64"
-   viewBox="0 0 64 64">
-  <path
-     d="M 32.003143,10.913072 57.432701,53.086929 6.567299,53.083723 z"
-     id="path2985"
-     style="fill:#ffff00;fill-opacity:0.94117647;fill-rule:nonzero;stroke:#000000;stroke-width:0.83403099;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none" />
-</svg>
+<svg xmlns="http://www.w3.org/2000/svg" width="64" height="64" viewBox="0 0 64 64"><path id="path2985" fill="#ff0" fill-opacity=".941" fill-rule="nonzero" stroke="#000" stroke-dasharray="none" stroke-miterlimit="4" stroke-opacity="1" stroke-width=".834" d="M 32.003143,10.913072 57.432701,53.086929 6.567299,53.083723 z"/></svg>

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

@@ -1,7 +1 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg
-   xmlns="http://www.w3.org/2000/svg"
-   width="40"
-   height="40"
-   viewBox="0 0 40 40">
-</svg>
+<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="0 0 40 40"/>