Fix tutorial

[mansona]

This PR adds a little script that I used to update the tutorial and I ran it to get the diffs for us.

Things to do before we merge this:

• [x] either manually or automatically update the external links from each version to the correct ember/ember-data versions
• [x] generally double check this works 🤷
• [x] any other things?

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[IgnaceMaes]

Could we have a short description and example usage of the script, if it gets included in source control?

[mansona]

sorry something wasn't clear with this PR 🙈 the actual script isn't intended to be used in the future, I only included it in the PR to make sure that we didn't lose the code. I've removed it now as the last commit 👍