Move scripts dir inside hm

And remove weird path contraptions

hm/scripts/pdfpages

@@ -0,0 +1,10 @@
+#!/usr/bin/env nix-shell
+#! nix-shell -i bash --pure
+#! nix-shell -p bash pdftk gnugrep gawk
+
+# From https://stackoverflow.com/a/14736593
+for FILE in "$@"
+do
+    printf "$FILE: "
+    pdftk "$FILE" dump_data | grep NumberOfPages | awk '{print $2}'
+done