Enable delegated routing

[lidel]

Delegated peer and content routing is supported by the latest js-ipfs (ipfs/js-ipfs#2155) + https://github.com/libp2p/js-libp2p-delegated-content-routing / https://github.com/libp2p/js-libp2p-delegated-peer-routing

Enabling it with *.delegate.ipfs.io should improve this sharing app:

• On the sender end provide call executes preload on delegate node (libp2p-delegated-content-routing/index.js#L90-L92)
• On the receiver end, delegated DHT provides alternative to ws-starwebrtc-star signaling