Add hostname to graph titles

Also use "$project cluster" as title instead of generic "overview"
so that it's different for differnet projects, keeps the image
more uniquely identifiable in isolation/reupload.
Don't cut off navigation for smaller window sizes

The "collapse" class should not've been used here. And the
viewport makes makes it harder, not easier, for users, since
they'll want to zoom and pan.

Also adjust the title to be more consistent with other tools.
(Lowercase "wmflabs".)
graphs: Add network-bytes and network-packets