some reorganisation, js deleted, readme updated

nb/script1.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+cp ../chapters/*.quarto_ipynb .
+for i in *.quarto_ipynb 
+    do
+      echo $i
+      mv $i "${i%.quarto_ipynb}.ipynb"
+      jupyter nbconvert --inplace --clear-output --to notebook "${i%.quarto_ipynb}.ipynb"
+    done