Use note short-codes instead of markdown

[elsalahy]

Summary

Update the note sections to use Hugo note wrapper.

Why do we need this ?

To be more consistent with the notes instructions throughout the repo.

What is already there? What do you see now?

Something like this

Note: Keep in mind that you can also see how this is done in the other example applications located in app folder.

What is missing? What do you want to see?

Should be replaced with something like this
{{< note >}}
Keep in mind that you can also see how this is done in the other example applications located in app folder.
{{</ note >}}

How do you propose to document this?

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Can you do this yourself and submit a Pull Request?

...