We have a lot of room in the top bar. We should advertise "Rerun.io` there.

Just put "Rerun.io" there nice and centered.

This is very useful when:

• Someone sees a Rerun screenshot and wants to know "what is this?"
• A third-party uses Rerun and someone looks over their should wondering "what is this?"
• We stream a demo in some web-cast and someone joins half-way through wondering "what is this?"
• …