refactor: use de gruyter ci

frontend/static/degruyter-icons/Simple/Small-16px/SVG/Action/Social/Social-Youtube-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-Youtube-SM</title>
+    <g id="🧩-Icons/Simple/Action/16px/Social/Social-Youtube-SM" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <path d="M8.18292642,3.00048658 C9.03472965,3.00461824 12.5013564,3.03767153 13.4519782,3.30209786 C14.0558826,3.46876833 14.5276268,3.94991226 14.6910412,4.56584967 C15.1534452,6.46422467 15.0465984,9.46243004 14.7000199,11.434066 C14.5366055,12.0500034 14.0648613,12.5311474 13.4609569,12.6978178 C12.5103351,12.9622442 9.04370837,12.9952974 8.19190514,12.9994291 L8.05126852,12.9999456 C8.01897714,13.0000193 8.00189654,13.0000193 8.00189654,13.0000193 L7.98931981,13.0000101 C7.98101323,13.0000009 7.96867024,12.9999825 7.95252455,12.9999456 L7.81188793,12.9994291 C6.9600847,12.9952974 3.49345793,12.9622442 2.5428362,12.6978178 C1.93893179,12.5311474 1.46718754,12.0500034 1.30377316,11.434066 C0.838675585,9.54393288 0.966173376,6.54389598 1.29479444,4.57500729 C1.45820882,3.95906988 1.92995307,3.47792595 2.53385748,3.31125549 C3.48447921,3.04682916 6.95110598,3.00676456 7.80290921,3.00088007 Z M6.60121658,5.85707434 L6.60121658,10.1428413 L10.2286185,7.99995784 L6.60121658,5.85707434 Z" id="Primary" fill="#000000"></path>
+    </g>
+</svg>