docs: update sidebar navigation

Author: mrholek

docs/layouts/partials/sidebar.html

@@ -56,10 +56,9 @@
       </li>
     {{- end }}
     <li class="nav-item">
-      <a href="{{ .Site.Params.icons }}" class="nav-link" target="_blank">
+      <a href="/icons/" class="nav-link" target="_blank">
         {{ partial "icons/pen-nib.svg" (dict "class" "nav-icon text-primary") }}
         Icons
-        <span class="ms-3">{{ partial "icons/external-link.svg" (dict "class" "icon icon-xs text-secondary") }}</span>
       </a>
     </li>
     <li class="nav-item">