This issue is a tracking issue for the updates that need to occur to the images in the GitKit 2nd Edition text.

The diagrams in the GitKit 2nd Edition text currently use circles of differing colors to indicate commits. These colors are sometimes hard to distinguish and are not fully accessible to those with color vision deficiencies.

Details of how to work on new images, and where and how they should be stored are given in the GitKit-Codespaces/materials/images/README.md file.

Each image to be updated is identified by a sub-issue below. It is suggested that you look at all of the images in a chapter before beginning work on any of the images in that chapter. All of the images currently in the text can be seen in one place by downloading the GitKit-Text-Source-Images.ppt file. Sometimes it may be easiest do them in a different order than they appear in the text by creating a full diagram and then successively removing pieces to create the others.

Each of the sub-issues linked below corresponds to one of the images in the text. To work on an image:

1. Assign yourself to the sub-issue.
2. Complete the image and text updates as per the README.
3. Create a pull request to the draw.io-images branch instead of the main branch.