Improve guides to use multiple overlays

[philsturgeon]

Using the CLI for mutliple overlays until the GHA supports it (bump-sh/github-action#509).

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[paulRbr]

About the overlay changes, we'll soon release the multiple overlay inputs in the GHA. Let's wait for that release to update the examples of the tutorials.

About the CLI docs, it's currently a copy of the CLI repo readme would you mind opening a PR there so review those changes independently?

Thanks!

[philsturgeon]

@paulRbr aha! I thought it felt familiar.

All CLI changes were made directly to CLI here: bump-sh/cli#647

Then some were brought back over here: #323

This PR is now just about adding examples of multiple overlays and updating things to use the github action where it makes sense.

[philsturgeon]

@ChristopheDujarric @paulRbr I've updated all GitHub Action examples that were using CLI for overlays to use GitHub Actions, including multiple overlays with , separation. Please merge if ready.

[paulRbr]

That's great! Thanks a lot Phil for this work. The overlay feature seems really integrated and part of the product like this 🙏

[ChristopheDujarric]

Thank you @philsturgeon ! ❤️