Add link-only property to folderitems (#377)

Author: fsimonis

_data/sidebars/tutorial_sidebar.yml

@@ -25,14 +25,17 @@ entries:
     - title: Flow over heated plate
       url: /tutorials-flow-over-heated-plate.html
       output: web
+      link-only: true
 
     - title: Partitioned heat conduction
       url: /tutorials-partitioned-heat-conduction.html
       output: web
+      link-only: true
 
     - title: Perpendicular flap
       url: /tutorials-perpendicular-flap.html
       output: web
+      link-only: true
 
   - title: All tutorials
     output: web

_includes/sidebar.html

@@ -26,7 +26,7 @@
       {% if folderitem.external_url %}
       <li><a title="{{folderitem.title}}" href="{{folderitem.external_url}}" target="_blank" rel="noopener">{{folderitem.title}}</a></li>
       {% elsif page.url == folderitem.url %}
-      <li class="active"><a title="{{folderitem.title}}" href="{{folderitem.url | remove: "/"}}">{{folderitem.title}}</a></li>
+      <li {% if folderitem.link-only == nil or folderitem.link-only == false %} class="active" {% endif %} ><a title="{{folderitem.title}}" href="{{folderitem.url | remove: "/"}}">{{folderitem.title}}</a></li>
       {% elsif folderitem.type == "empty" %}
       <li><a title="{{folderitem.title}}" href="{{folderitem.url | remove: "/"}}">{{folderitem.title}}</a></li>