Add build script

sessions/build.sh

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