[Bug] Fix changelog location

[vascolp]

Hi! Changelog is not updated anymore? From code you have a button directly to the changelog... and it is a bit outdated... 2.3.0....

Thanks!

[laurensvalk]

You can view the main changelog here: https://github.com/pybricks/pybricks-micropython/blob/master/CHANGELOG.md

We do need to fix the changelog of the editor and the links to it, so we'll keep this one open. Thanks!