Add local WS numbers beside each WS in the tree view

[matiroy]

This would make easier to refer to them in the Malicious Team Google Docs.

Discussion reference with Meghan and Matthias: https://app.slack.com/client/T3L8K3NMT/CL6PM7L94/thread/CL6PM7L94-1566937470.082300?thread_ts=1564795608.023600

[brachbach]

Just to be clear, "local workspace number" is 4145 for this workspace: https://mosaic.ought.org/w/4145

right?

[matiroy]

right. and global is 4143

[brachbach]

I don't think we should call that the global number, I think we should call it the tree number

so then we'd have "workspace number" and "tree number"

[matiroy]

oh right, I agree