Use chevrons not slashes to separate folders

It looks weird to have two different visual treatments for showing a
navigable hierarchy.

I reckon losing the slash won’t make things less folder like – Windows
for example uses chevrons as foler separators.

app/templates/components/folder-path.html

@@ -79,5 +79,5 @@
 
 
 {% macro folder_path_separator() %}
-  <span class="folder-heading-separator">/</span>
+  <span class="folder-heading-separator"></span>
 {% endmacro %}