Fix blog

docs/_includes/components/breadcrumb.html

@@ -0,0 +1,36 @@
+<div class="bd-breadcrumb">
+  <nav class="breadcrumb" aria-label="breadcrumbs">
+    <ul>
+      {% for key in page.breadcrumb %}
+        {% assign link = site.data.links.by_id[key] %}
+        <li{% if forloop.last %} class="is-active"{% endif %}>
+          <a href="{{ site.url }}{{ link.path }}">{{ link.name }}</a>
+        </li>
+      {% endfor %}
+    </ul>
+  </nav>
+
+  {% if previous_link or next_link %}
+    <nav class="bd-prev-next">
+      {% if previous_link %}
+        <a href="{{ site.url }}{{ previous_link.path }}" title="{{ previous_link.name }}">
+          ←
+        </a>
+      {% else %}
+        <span>
+          ←
+        </span>
+      {% endif %}
+
+      {% if next_link %}
+        <a href="{{ site.url }}{{ next_link.path }}" title="{{ next_link.name }}">
+          →
+        </a>
+      {% else %}
+        <span>
+          →
+        </span>
+      {% endif %}
+    </nav>
+  {% endif %}
+</div>