logo -> logo_url only

Author: JeanKossaifi

tensorly_sphinx_theme/navigation.html

@@ -5,7 +5,7 @@
         {# Always displayed, last item has to be navbar-burger  #}
 
           <a class="navbar-item" href="{{ pathto(master_doc) }}">
-			      {%- if logo %}
+			      {%- if logo_url %}
             <img src="{{ logo_url }}" height="28">
             {%- else %}
             {{ project }}