allow url-canonical in footer

_includes/footer.html

@@ -19,7 +19,9 @@
 
       {% if site.url-pretty %}
          • 
-        <span class="author-site"><a href="{{ '' | absolute_url }}">{{ site.url-pretty }}</a></span>
+        <span class="author-site">
+          <a href="{% if site.url-canonical %}{{ site.url-canonical }}{% else %}{{ '' | absolute_url }}{% endif %}">{{ site.url-pretty }}</a>
+        </span>
       {% endif %}
 
       {% if site.matomo %}