refactor: use de gruyter ci

frontend/static/degruyter-icons/Simple/Small-16px/SVG/Action/Social/Social-Twitter-SM.svg

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="16px" height="16px" viewBox="0 0 16 16" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <title>🧩 Icons/Simple/Action/16px/Social/Social-Twitter-SM</title>
+    <g id="🧩-Icons/Simple/Action/16px/Social/Social-Twitter-SM" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <path d="M15,12.5637039 C14.4849478,12.3242448 13.9350809,12.1620999 13.3514233,12.089081 C13.9496058,12.4656175 14.3971383,13.0570352 14.6108949,13.7534826 C14.0478761,13.4020474 13.4312962,13.1550335 12.7882449,13.0232935 C10.4638542,15.4393604 7.18718001,12.9330937 7.89371288,10.2743463 C5.5078845,10.3999818 3.38828589,11.5951295 1.97522015,13.4206023 C1.16219537,11.9709621 1.69158304,10.1884417 2.86401802,9.4045622 C2.39299611,9.42002503 1.9506451,9.55596906 1.56358796,9.78146863 C1.56317837,9.76879771 1.56317837,9.75623416 1.56317837,9.74367061 C1.56317837,8.28329241 2.55334835,7.06988993 3.8670899,6.79069998 C3.41961909,6.67472877 2.99160352,6.65647404 2.56665984,6.73915722 C2.9322138,5.54723089 3.98996519,4.67744681 5.24943682,4.64523259 C3.97972558,3.63370592 2.5052222,3.21706861 1,3.39961588 C7.4816711,-0.594948026 13.5947164,4.63449451 13.5742371,10.6156023 C13.5741733,10.7452206 13.5714763,10.8748228 13.5661479,11.0043206 C14.1272783,11.4295484 14.6105878,11.9600093 14.9996928,12.5613415" id="Primary" fill="#000000" transform="translate(8.000000, 8.000000) scale(1, -1) translate(-8.000000, -8.000000) "></path>
+    </g>
+</svg>