samples(config) Provide an example of 12-factor configuration

[kibertoad]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md

PR Type

What kind of change does this PR introduce?

[X] Other... Please describe:

Improved sample to provide a real-world configuration example

What is the current behavior?

Sample uses hardcoded value

Issue Number: #1566

What is the new behavior?

Sample uses value from configuration

Does this PR introduce a breaking change?

[ ] Yes
[X] No

[kamilmysliwiec]

Thank you for your contribution. Unluckily, I can't merge it. See my post here: https://github.com/nestjs/nest/issues/1566

[lock]

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