Live, bi-directional sharing via unique pubsub rooms

[lidel]

A cool demo example with live-sharing PoC landed in ipfs/js-ipfs#1343

In short, it enables people to:

1. Create "shared folders" through workspaces named after the url (which creates pubsub room)
2. User A goes to localhost:8080/#workspace-xpto and drops a file
3. User B goes to localhost:8090/#workspace-xtpo and sees that the file is there
4. From this point forward, any file that gets dropped by A or B gets shared to all users (via pub sub)

I think the general idea is super awesome, similar to https://volafile.org/ (but without chat) and just wanted to create this issue in case we want to pick it up in future.

Not sure if this app is the right place, but it felt like a better one for such experimentation than ipfs/ipfs-gui#34

On the UX side, this "Ephemeral live folder" could be just be a second button below the old one: