Add Github image to 'Code' link

_data/nav.yml

@@ -7,6 +7,7 @@
 - name: Code
   new_tab: true 
   link: https://github.com/TTWNO/
+  image: /assets/img/github.png
 - name: Links
   link: /links/
 - name: Ideas

_includes/nav.html

@@ -3,7 +3,12 @@
   <label for="menu">&#9776;</label>
   <div class="menu-content">
     {% for item in site.data.nav %}
-      <a href="{{ item.link }}" class="nav-link" {% if item.link == page.url %} class="on-page"{% endif %} {% if item.new_tab == true %} target="_blank" rel="noopener noreferrer" {% endif %}>{{ item.name }}</a>
+      <a href="{{ item.link }}" class="nav-link" {% if item.link == page.url %} class="on-page"{% endif %} {% if item.new_tab == true %} target="_blank" rel="noopener noreferrer" {% endif %}>
+        {% if item.image %}
+          <img src="{{ item.image }}" alt="{{ item.name }}">
+        {% else %}
+          {{ item.name }}
+        {% endif %}</a>
     {% endfor %}
   </div>
 </nav>