feat: add svg icon for linktree (#1652)

Author: GiggleSquid

layouts/partials/svg.html

@@ -521,6 +521,11 @@
     <rect x="2" y="9" width="4" height="12"></rect>
     <circle cx="4" cy="4" r="2"></circle>
 </svg>
+{{- else if (eq $icon_name "linktree") -}}
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" stroke="none">
+  <path
+    d="m13.73635 5.85251 4.00467-4.11665 2.3248 2.3808-4.20064 4.00466h5.9085v3.30473h-5.9365l4.22865 4.10766-2.3248 2.3338L12.0005 12.099l-5.74052 5.76852-2.3248-2.3248 4.22864-4.10766h-5.9375V8.12132h5.9085L3.93417 4.11666l2.3248-2.3808 4.00468 4.11665V0h3.4727zm-3.4727 10.30614h3.4727V24h-3.4727z" />
+</svg>
 {{- else if (eq $icon_name "mastodon") -}}
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"
     stroke-linecap="round" stroke-linejoin="round">