fix: don't link site name if on root

src/_includes/partials/header.liquid

@@ -1,6 +1,10 @@
 <div class="main__title">
   <h1>
+    {% if page.url != '/' %}
     <a href="/">{{ meta.siteName }}</a>
+    {% else %}
+    {{ meta.siteName }}
+    {% endif %}
   </h1>
   {% render "partials/nav/menu.liquid", page: page, nav: nav %}
 </div>