Feature: Code for running online replica node

[nicola]

trafficstars

Hey, I think my issue is different from the pinning issue: https://github.com/ipfs-shipyard/peerpad/issues/90

I want to:

• be able to close my laptop
• the pad should still be available since my replica node is up alive
• when someone connects, they should connect to the replica node

Feel free to close it, if this is the same as: https://github.com/ipfs-shipyard/peerpad/issues/90