Thanks for all the work on this one @tobyhodges. I browsed through the episodes and everything looked fine.

One suggestion I'd have is to perhaps rename the junk- image files to shapes- or something like that.

Good suggestion thanks @uschille. Taken care of in adbc4a5

@tobyhodges Using the jpgs for the histograms and challenges episodes is due to my changes. I actually hadn't realised the tifs existed! I'll take a look at this. If the tifs are higher resolution, then we should probably use those instead...

@tobyhodges I just checked - and the tif and jpg versions seem to be identical in size/content. As jpg uses lossy compression though, I think it'd be better to keep the tif versions and remove the jpg. In the long run, we could also save these as png instead to make them more consistent with the rest of the images in the lesson.

Thanks @uschille for finishing the renaming task.

@K-Meech with the last few commits I restored the TIFF versions of wellplate-02 and the colonies- files - please could you glance over those quickly in case I missed something? Then, I think this one is good to go 🤞