Improve the PR merged message from a new contributor

[TooAngel]

When a PR request is merged from a new contributor, the comment of the Pull Request should contain more information about the consequences.

Due to the world driven system contributions on a repository also lead to a certain, let's say, responsibility for the progress of the project.

When a PR is merged and the owner does not have any commits on the repository, the message could be something like:

This pull request was merged by [worlddriven](https://www.worlddriven.org).

Thank you {} for contributing. This repository is world driven and is driven by all contributors, now you are part of us, we are glad you are here.
From now on you can speed up or slow down future Pull Requests by reviewing these.