A wider screen & higher resolution, to match what most current
screens are like.
We should make the default configurable, for people on low bandwidth
connections.
This sucks - we are vendoring in a library *and*
modifying a single file (vnc_lite.html) in there.
Pathway out of this is to make this into a Jupyter Server
extension that can render the standalone vnc_lite.html UI
properly in the Jupyter theme.
Until then...