docs(tutorials/blog): Add a note about the required setup phase

[GaneshSrambikal]

These changes are a reference to issue https://github.com/remix-run/indie-stack/issues/286

Hope this is a minor tweak but would be helpful for new learners visiting the page.

Closes: #

• [x] Docs
• [ ] Tests

Testing Strategy:

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[remix-cla-bot[bot]]

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[remix-cla-bot[bot]]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[GaneshSrambikal]

Thank you for the review. The suggestion was helpful. thank you, team and @machour