137 reorganise images

[tobyhodges]

Fixes #137
Fixes #173
Fixes #83 (thank you to @mmeysenburg for sharing the file with me by email!)
Fixes #84

Replaces #153 because the merge conflicts were getting chaotic.

A couple things that need discussing:

1. This PR will delete a lot of image files that do not seem to be used in the lesson anymore. It also removes all the image files in the subfolders of code/, because It believe the duplication is now unnecessary. I want to highlight:
   a. the removal of code/05-creating-histograms/plate-01.tif because we seem to be using the JPEG in the challenge now instead?
   b. the removal of code/09-challenges/colonies*.tif because again we seem to be using the JPEGs throughout the lesson now?
2. I chose the fig/07-junk.jpg file as the main "junk" image to use in data - it does not have the black outline around it, so seems like the best source image to use in processing during the lesson?

[uschille]

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.

[tobyhodges]

Good suggestion thanks @uschille. Taken care of in adbc4a5

[uschille]

Thanks again @tobyhodges. I have updated the Markdown files for the episodes and I think all looks good.

[K-Meech]

@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...

[K-Meech]

@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.

[tobyhodges]

Thanks @uschille for finishing the renaming task.

[tobyhodges]

@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 🤞

[quist00]

Looks good on my local build.