Document minimum git version for Quarto publish in our Step by Step guide

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Description

Feedback from https://github.com/quarto-dev/quarto-cli/issues/9025#issuecomment-1989502391 - Our Quarto manuscript walkthrough seems to have some technical requirements that are not that obvious for all R users

(1) turns out, latest version of Git is required.

Scotts-MacBook-Pro-2:MS-Open-Salmon-KG Scott$ quarto publish gh-pages
ERROR: git version 2.17.0 or higher is required to publish to GitHub Pages

I expected latest Git via updating Xcode on Mac. Nope.

Scotts-MacBook-Pro-2:MS-Open-Salmon-KG Scott$ git --version
git version 2.13.1

Fine, follow instructions to download GIT... Nope. Result: included image.
Plan B involves HomeBrew which is not a CRAN package: disconcerting,
paranoious.

Following a1462c403b6aa99af48cf989bae5594cfc32d1d6, we should maybe add in a few places the minimum git requirement for Quarto publish.

Start with the Step by Step guide and inspect commit a1462c403b6aa99af48cf989bae5594cfc32d1d6 for the relevant publishing documentation. Identify the places where Quarto publish requirements are described and document that Git 2.17.0 or higher is required. Done means the minimum Git version is clearly stated for the affected publishing workflow.