Ruby on Rails, Blog app project: Updated link to most recent Rails blog tutorial

[Roxanoel]

Because

As of Rails 8.0, the Getting Started project has changed: it is no longer the "Build a blog" project. In order to be more exact, we would have to either change the entire project, or at least link to the most recent "Getting Started" project that involves building a blog (i.e., Rails 7.2). Since changing the project's nature and name is a more involved process, I have simply changed the link for now, so that it links to the page it initially referenced.

This PR

• Changes the link in the "Project: Blog App" Rails page so that it refers to the correct tutorial.

Issue

Closes #29249

Additional Information

N/A

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[JoshDevHub]

Wow that is a big change to the guides. I agree with your approach that the best way for now is to point learners to the old blog project, but we'll maybe want to open an issue for discussing a larger shift to using their new project (feel free to do this if you want! Or I can handle it later).

As for this PR, I'd be glad to approve it after the merge conflict is resolved.