refactor: use de gruyter ci

frontend/static/degruyter-icons/Simple/Large-32px/SVG/Action/Library-LG.svg

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="32px" height="32px" viewBox="0 0 32 32" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <title>🧩 Icons/Simple/Action/32px/Library-LG</title>
+    <g id="🧩-Icons/Simple/Action/32px/Library-LG" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <path d="M16,2 L30,10 L30,14 L26,14 L26,24 L28,24 L28,28 L30,28 L30,30 L2,30 L2,28 L4,28 L4,24 L6,24 L6,14 L2,14 L2,10 L16,2 Z M26,26 L6,26 L6,28 L26,28 L26,26 Z M10,14 L8,14 L8,24 L10,24 L10,14 Z M15,14 L12,14 L12,24 L15,24 L15,14 Z M20,14 L17,14 L17,24 L20,24 L20,14 Z M24,14 L22,14 L22,24 L24,24 L24,14 Z M16,4.303 L4,11.16 L4,12 L28,12 L28,11.161 L16,4.303 Z M16,6.375 C16.9664983,6.375 17.75,7.15850169 17.75,8.125 C17.75,9.09149831 16.9664983,9.875 16,9.875 C15.0335017,9.875 14.25,9.09149831 14.25,8.125 C14.25,7.15850169 15.0335017,6.375 16,6.375 Z" id="Primary" fill="#000000"></path>
+    </g>
+</svg>