refactor: use de gruyter ci

frontend/static/degruyter-icons/Simple/Large-32px/SVG/Action/Attach-More-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/Attach-More-LG</title>
+    <g id="🧩-Icons/Simple/Action/32px/Attach-More-LG" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <path d="M21.5360308,4.93966438 C23.4722705,3.02011187 26.6079797,3.02011187 28.5442194,4.93966438 C30.4264408,6.80566403 30.4834778,9.79931365 28.7153305,11.7336557 L28.5442194,11.9118301 L13.8439339,26.4854232 C11.1344805,29.1715256 6.7451442,29.1715256 4.03569081,26.4854232 C1.383124,23.8557172 1.32283839,19.6258026 3.85483398,16.9233599 L4.03569081,16.737335 L11.0358268,9.79752875 L12.4439067,11.2178495 L5.44377071,18.1576557 C3.5187431,20.0660928 3.5187431,23.1566655 5.44377071,25.0651025 C7.31511967,26.9203235 10.3172857,26.9765423 12.257169,25.233759 L12.435854,25.0651025 L27.1361395,10.4915094 C28.2879535,9.3496222 28.2879535,7.5018723 27.1361395,6.35998512 C26.0257892,5.25920417 24.249874,5.21517293 23.0862785,6.2278914 L22.9441107,6.35998512 L8.9438387,20.2395976 C8.56523843,20.614935 8.56523843,21.219862 8.9438387,21.5951994 C9.29774757,21.9460581 9.85766221,21.9730473 10.2432643,21.6761668 L10.3358132,21.5951994 L22.936058,9.10354813 L24.3441379,10.5238689 L11.7438931,23.0155201 C10.580867,24.1685228 8.69878485,24.1685228 7.5357588,23.0155201 C6.41464481,21.9040683 6.36980025,20.12634 7.40122512,18.961586 L7.5357588,18.8192769 L21.5360308,4.93966438 Z" id="Primary" fill="#000000"></path>
+    </g>
+</svg>