add default exclusions for the example code

[walteck]

Description

The repository template includes examples of code, as well as a template configuration for Sonarcloud, this is resulting in Sonarcloud raising findings against the example code on all repositories that use the template.

Context

This change is to extend the Sonarcloud configuration to exclude the example code from the template.

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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[regularfry]

docs/** is fine, but I don't think we want to exclude scripts/**. There's quite a lot of shell and make in there that we do want covered.

I've also removed the python hello_world example so the original motivating failures for this PR should (I think) have gone away.