Update schedule.html

_includes/swc/schedule.html

@@ -4,7 +4,7 @@ <h3>Plan for the day</h3>
     <table class="table table-striped">
       <tr> <td>Before</td> <td><a href="{{ site.pre_survey }}{{ site.github.project_title }}" target="_blank" rel="noopener noreferrer">Pre-workshop survey</a> </td> </tr>
       <tr> <td>09:00</td>  <td>
-	      <a href="https://swcarpentry.github.io/shell-novice/02-filedir/index.html">Intro and Navigating Files and Directories</a> </td> </tr>
+	      <a href="https://swcarpentry.github.io/shell-novice/02-filedir.html">Intro and Navigating Files and Directories</a> </td> </tr>
       <tr> <td>10:30</td> <td>Morning break</td> </tr>
       <tr> <td>11:00</td> <td>
 	      <a href="https://swcarpentry.github.io/shell-novice/04-pipefilter/index.html">Pipes and Filters</a> </td> </tr>