PR Summary

• Upgrade of project version to 0.30.0-alpha
  The version number of our project has been upgraded from 0.29.0 to 0.30.0-alpha across several files: gatherpress.php, latest.php, package-lock.json, package.json and the stable tag in readme.md. This is an important milestone representing the next phase of our project.

• Addition of new contributors
  A new array of contributors who have contributed to this latest version (0.30.0-alpha) has been added to credits.php. This ensures that all contributors get the acknowledgment they deserve for their input to the project.

Please note, as this is an alpha release it means we are at a very early stage of testing for the 0.30.0 version, and there may be significant changes before the final release.