Add release script

sessions/release.sh

@@ -0,0 +1,12 @@
+#!/bin/zsh
+
+set -e
+
+if [[ -z $1 ]]; then
+  echo "Usage: build.sh NUMBER"
+  exit 1
+fi
+
+
+darkslide --linenos=no "${1}.md" --embed --destination "${1}.html"
+prince "${1}.html" -o "${1}.pdf"