First attempt at writing the installer

updateindex.nu

@@ -0,0 +1,10 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -p jq nushell -i nu
+
+open index.json
+| each {|entry| 
+  {src: $entry.src, dest: $entry.dest, 
+  hash: (cat $entry.src | hash sha256)}
+}
+| collect
+| save -f index.json