Docs: Consistent example in Best Practices for different approaches

[virkt25]

Best Practices section in Docs is extensively written using a top-down approach. LB4 supports both top-down and bottom-up approach. #735 will add a section on bottom-up approach but using the loopback4-example-getting-started repo which was built using the bottom-up approach.

This creates confusion since users will be faced with two different examples documenting the two different approaches which may makes it harder to understand. Users should be able to compare both approaches by being shown the approaches for the same example.

Acceptance Criteria

• Update the bottom-up page to use the same example as the top-down approach.
• Update any other areas for Best Practices to ensure the same example is used consistently.

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This issue has been closed due to continued inactivity. Thank you for your understanding. If you believe this to be in error, please contact one of the code owners, listed in the CODEOWNERS file at the top-level of this repository.