refactor(iroh-automerge): Make the example use the main iroh API inst…

…ead of iroh-net (#74)

* refactor(iroh-automerge): Make iroh-automerge based on iroh, instead of iroh-net

* fix: Use result

* refactor: Extract out `IrohAutomergeProtocol` into `protocol.rs`

* refactor: Remove unnecessary newtype struct

* refactor: Use `Automerge` instead of `AutoCommit`

* refactor: clean up initiate and receive functions

* refactor: Let `main.rs` know about snycs via an mpsc channel

* refactor: Simplify: Remove the relay url parameter

* docs: Write more comprehensive readme

* refactor: Disable docs

* refactor: Use async Mutex