Update guided-tour.md

[fmaiabatista]

Description

Describe your PR! If it fixes specific issue, mention it with "Fixes # (issue)".

Hey 👋

I'm going through the Guided Tour and I found that when I changed my app name, I also had to migrate the DB again, and my previous data was lost. I added this info to the warning box so other users are aware of the impact.

By the way, the Edit page button in the docs are pointing to the deployed-version branch, which I found to be outdated. I had to find the new path to the doc file in the main branch to propose the changes. See below:

Let me know if my understanding and proposed changes are accurate and feel free to merge the PR as is or further change the text!

Contributor Checklist

Make sure to do the following steps if they are applicable to your PR:

• Update e2e tests: If you changed the /template/app, then make sure to do any neccessary updates to /template/e2e-tests also.
• Update demo app: If you changed the /template/app, then make sure to do any neccessary updates to /opensaas-sh/app_diff also. Check /opensaas-sh/README.md for details.
• Update docs: If needed, update the /opensaas-sh/blog/src/content/docs.

[Martinsos]

Thanks for the insightful PR @fmaiabatista !

Based on your second suggestion (edit page), I creaetd this PR -> good catch!

As for the warning for app name change -> thanks, I modified it a bit but kept the intent / information. I will merge this now!