feat: add table of contents to blog posts

website/source/_includes/post/heading-with-anchor.html.twig

@@ -0,0 +1,3 @@
+<a name="{{ text|lower|replace({ ' ': '-' }) }}"></a>
+
+<h2>{{ text }}</h2>

website/source/_includes/post/table-of-contents.html.twig

@@ -0,0 +1,9 @@
+{% if toc %}
+    <ul>
+        {% for title in toc %}
+            <li>
+                <a href="#{{ title|lower|replace({ ' ': '-' }) }}">{{ title }}</a>
+            </li>
+        {% endfor %}
+    </ul>
+{% endif %}

website/source/_layouts/post.html.twig

@@ -16,6 +16,8 @@
             </div>
 
             <div class="markdown">
+                {% include "post/table-of-contents" with { toc: page.toc } only %}
+
                 {{ parent() }}
             </div>