Add landslide.sh to upstream-training

The landslide.sh script (re)builds all presentations in the
upstream-training directory.

Change-Id: I26487da60d486e4c5346c72673fbf24e796d1c17

doc/upstream-training/README

@@ -12,7 +12,12 @@ Install the latest stable version of Landslide with a python package manager lik
 
   $ pip install landslide
 
-To build the presentations
+To build a presentation
+-----------------------
+
+  $ landslide -r -d <presentation.html> <presentation.rst>
+
+To build all presentations
 --------------------------
 
-  $ landslide <presentation.rst>
+  $ ./landslide.sh

doc/upstream-training/landslide.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+which landslide
+LANDSLIDE_MISSING=$?
+
+if [[ ${LANDSLIDE_MISSING} -ne 0 ]]; then
+    echo "landslide isn't on your path.  Do you need to activate a virtual environment?"
+    exit 1
+fi
+
+for presentation in *.rst; do
+    presentation_name=$(basename "${presentation}" .rst)
+    landslide -r -d "${presentation_name}.html" "${presentation}"
+done