Add URL to Header

My personal theory (I'm not an Adobe employee) is that when building a completely new version of RH they decided to build only what they thought people used, rather than replicate things that were no longer needed.

You can request features and report issues here: https://tracker.adobe.com/

The logo by default links to the default topic defined for your project. I think that was the case for RH2017 also and I've never tried to change that behaviour.

If you forced a different link in the topic.slp, then that method is not longer available as you've noticed.

You might be able to modify the output, but you'd need to make that change every time you generate. Or there's also the Post Generation Script field in the output preset that a developer might be able to do something with. Or perhaps you can get a javascript developer to write a script that you can attach in the User Assets section of the skin which will inject the link you need at run time.

Or you can submit a feature request here: https://tracker.adobe.com/