Add namespace creation to hello-world example

[LindaOrtega]

Please confirm the following:

• I have read the Code of Conduct
• The improvement was not suggested before

What page or file should be improved?

The sample hello world step-by-step -> https://docs.kadena.io/build/pact/hello-world

What part(s) of the article would you like to see updated?

This sample could be improved for newcomers with custom namespace creation since they’ll be encountering deployment issues when trying to deploy the contract under the same name.

Additional information

Context: This was flagged by developer trying to find a hello world easy for developers.

Participation

• I am willing to submit a pull request for this improvement.