docs: improve the presentation of the example

[forresst]

What is it?

• [ ] Feature / enhancement
• [ ] Bug
• [X] Docs / tests

Description

In the first tutorial (Welcome), the example describes 2 components, one is static and the other is dynamic. Visually, it is not obvious to see the separation of the two.

Here is a proposal to make it easier to see.

Before:

After:

Use cases and why

Nope

Checklist:

• [X] My code follows the developer guidelines of this project
• [X] I have performed a self-review of my own code
• [X] I have made corresponding changes to the documentation
• [ ] Added new tests to cover the fix / functionality

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