Using images to start discussion on Git, for IAC science coffee

Until now, we would immeditely jump from the part on answering the
project's questions to Git branches. But this isn't too useful for
someone who doesn't know Git! So to start the Git branching
discussion, now we first show a small image of the workflow with a
"today" printed over it. Then another one with a "tomorrow". In the
next slide we abstract them to circles with hashes!

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