Folder of images for Lecture multi-échelles de données structurées translated lesson

[spapastamkou]

I open this issue to document the removal of a folder with image files from this repository.
The folder in question is: /images/lecture-donnees-structurees with copies of the images of the EN lesson (3) under FR name (but not translated). These are images in relation with #482.
The images of all versions of the original EN lesson (Scalable reading of structured data) are/should be in /images/scalable-reading-of-structured-data - once the FR translated images are generated, their place is there. For the time being, the FR translation has slugs of the EN files of this second folder (which are exactly the same contained in the first folder) as usual.
Thus I delete the first folder and files that are of no use.