Update the toc setup in html to archive a proper toc at sidebar

Author: Jianwen0451

docs/_includes/toc.html

@@ -18,7 +18,11 @@ <h2>Quick Navigation</h2>
         {% if item.toc %}
         <button onclick="toggleTOC('{{ item.title | replace: ' ', '-' }}')">Details</button>
         <div id="toc-{{ item.title | replace: ' ', '-' }}" class="toc-content hidden">
-          {% include toc.html %}
+          <ul>
+            {% for heading in page.content | toc %}
+            <li><a href="#{{ heading.id }}">{{ heading.text }}</a></li>
+            {% endfor %}
+          </ul>
         </div>
         {% endif %}
       </li>