Improve circuit relay setup

[d-roak]

Currently the whole circuit relay "kinda works". It's working, you can relay connections, but it's cumbersome. Check alternatives to setting it up and try to enable direct webrtc

Look into:

• https://docs.libp2p.io/guides/getting-started/webrtc/
• https://universal-connectivity.vercel.app/
• https://github.com/libp2p/universal-connectivity

[d-roak]

We still need to investigate on how to do it w/ VPNs, probably public nodes subscribed to the pubsub group will probably fix this edge case. Right now it's out-of-scope.