Added icons

Signed-off-by: Janne Koschinski <janne@kuschku.de>

assets/favicon.svg

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+          fill="url(#linearGradient861)"/>
+</svg>

assets/images/logo.svg

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+        </linearGradient>
+        <linearGradient id="linearGradient859" gradientUnits="userSpaceOnUse" x1="0" y1="0" x2="1024" y2="0">
+            <stop stop-color="#4c4c4c" offset="0"/>
+            <stop stop-color="#1a1a1a" offset="1"/>
+        </linearGradient>
+    </defs>
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