* Refactoring dapps to support API endpoints.

* Using ContentHandler for unauthorized requests

* Extracting url stuff

* Adding ping endpoint

* CORS support for ping request

* Fixing url.is_none()

* minor formatting fix

[ci:skip]

* Refactoring dapps to support API endpoints.

* Using ContentHandler for unauthorized requests

* Basic signing queue

* Adding docs

* WebSockets server for signer

* Removing TODO

* Shortening the syntax

* Exposing types from RPC

* Fixing indentation

* Update main.rs