[BUG] 404 error

[jonadem]

Describe the bug
Browsing to "Books > Free Progamming Books > English" (same behavior with French, haven't tried others) gives a 404 error page

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Books > Free Progamming Books'
2. Click on 'English' (or 'French / français')
3. See error 404

Expected behavior
Reach this content :

• https://github.com/EbookFoundation/free-programming-books/blob/master/books/free-programming-books.md
• https://github.com/EbookFoundation/free-programming-books/blob/master/books/free-programming-books-fr.md

[carolinaknoll]

Hello, @jonadem! 👋

Thank you for pointing out this bug! I wont have time to look at it now, but from what I checked from your links, they should indeed be opening correctly instead of being 404. 🤔

I'm sorry for not providing a fix for it now, but I will take a deeper look in the following weekends and see if I can come up with a fix. You can also submit anything if you'd like to go deeper on this issue, but it's okay if you wouldn't like to do it as well.

Thanks again for your effort, and please take care. ✨