[Feature]: move template folder content to root level

[sjuergen]

Problem Statement

currently we've only one way of providing repo content via a template which is an apax create on a specific package. Whenever somebody want's to create a repository with a certain structure starting from the GitHub UI this is not possible

Proposed Solution

handle template-app not as a template package, but as a repository that holds the template content itself

First step: move completly every content of the template folder to the root folder of the repository.
2nd step: adapt workflows

Alternatives Considered

No response

Additional Context

No response

Code of Conduct

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