Update default.html

_layouts/default.html

@@ -75,7 +75,7 @@
         <h1><a href="{{ "/" | relative_url }}">{{ site.title | default: site.github.repository_name }}</a></h1>
         
         {% if site.logo %}
-          <img src="site.logo" alt="Logo" />
+          <img src="{{ site.logo }}" alt="Logo" />
         {% endif %}
 
         <p>{{ site.description | default: site.github.project_tagline }}</p>