No I don’t think that will work. The Portal is not part of the theme.
I did some more digging and found this thread:
Which has more useful detail but importantly, context. Seems like its a conscious decision on the part of the Ghost team.
I’ve taken the approach of downloading the portal JS file, making my changes and hosting it myself and then setting my config to use it.
I’ve changed to a dark theme doing this and removed the “Powered by” items also. Its pretty easy to do but just feels a bit “wrong”.
I can also no longer find an up to date repo for the portal. Is this no longer open sourced? The one linked to in the post above is not longer active and a major version behind what is current.
It’s a shame if the portal is no longer open sourced. Would be good to understand the Ghost teams reasoning behind this as it seems a bit at odds with the approach to everything else which allows you to customise/ self host etc.