fix time series presentation link - fixes #275

themes/grass/layouts/learn/list.html

@@ -58,7 +58,7 @@ <h2 class="section-title">Get to know the GRASS GIS ecosystem</h2>
 
     <div class="col-lg-8 col-sm-6 mb-4 bg-white">
         <img src="/images/gallery/temporal/tgrass_flowchart.png" width="40%" alt="TGRASS Flowchart" style="float:right;padding-top:20px">
-        <a href="https://gitpitch.com/veroandreo/grass_opengeohub2019/master?p=slides/tgrass_lst" class="px-4 py-4 d-block htl"><h3 class="mt-2 mb-4">Time series in GRASS GIS</h3></a>
+        <a href="https://github.com/veroandreo/grass_opengeohub2019/raw/master/pdf/tgrass_lst.pdf" class="px-4 py-4 d-block htl"><h3 class="mt-2 mb-4">Time series in GRASS GIS</h3></a>
         <b>Analyzing spatio-temporal data with GRASS GIS</b><br>
         Hands-on workshop at the 2019 <a href="https://opengeohub.org">OpenGeoHub</a><br>
         Summer School