Idea: Simplify daemon configuration from webui

At the moment you have a pretty non user friendly way to configure webui that requires user to:

1. CORS are configured appropriately.
2. Daemon is running.
3. It uses default `5001` port.

And take appropriate actions usually requiring running things in terminal, and possibly entering some results back to webui.

### Idea

I like to propose improved flow. Desktop apps can register themself as handlers of custom protocol, and that could be used to say register `ipfsdaemon:` protocol and have link in the in the webui that once clicked will trigger daemon that can in return encode it's config like `port` into query string and open triggering page with that query, letting webui know how to reconfigure itself.

You can use similar idea to request daemon to change CORS settings as well.