Make Chatbox render optional text / links in header

[RachBLondon]

It would be good if it was possible optionally render additional text and or a link, in the header of Chatbox. This would be beneficial in 3Box Hub, where we are often getting requests and comments that would be best handled in discord. Making it a property would allow other applications to also customize with their own text.

Perhaps giving the option to render text and or a link in the location show below (excuse my bad diagram).