Add docs describing the several components used to render a MR Diff
What does this MR do and why?
I'm just writing stuff. This is super-drafty, because I need to actually write something in order to understand what I want to have had written after all.
Screenshots or screen recordings
Screenshots are required for UI changes, and strongly recommended for all other merge requests.
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #381604 (closed)