Improve short description and remove preview flag

[planger]

What it does

Improves the out-dated short description of the extension and removes the preview flag for the future releases.

How to test

Nothing really to test.

Review checklist

• [X] as an author, I have thoroughly tested my changes and carefully followed the contribution guidelines

Reminder for reviewers

• as a reviewer, I agree to behave in accordance with the code of conduct