At the head of the [course notes](https://uomresearchit.github.io/Programming-With-Python/01-introduction.html), there is a course progress bar that shows NaN% <img width="1817" height="319" alt="Image" src="https://github.com/user-attachments/assets/c76f2c46-d122-41dd-9253-67f6fc7d0dc7" /> Work out why this is broken and fix it
At the head of the course notes, there is a course progress bar that shows NaN%
Work out why this is broken and fix it