Docs on connection outdated. I would like to take care and refactor it

[lucafabbian]

Hi.

I've seen that the docs on "how to start a session" are outdated.

For example, I used to run:

const {webSocketDebuggerUrl} = await fetch('http://localhost:9222/json/version').then( t => t.json())
const browser = await launch({ wsEndpoint: webSocketDebuggerUrl, headless: false,});
console.log(browser.wsEndpoint());

Which is not possible anymore, despite being part of the docs.
In general, I think it's weird that there are multiple functions to open a session, and that there is not one to connect to a manual browser from the remote debuggin url.

I would like to propose a complete refactor of this method and to document it, if you agree. Possibly taking inspiration from puppetter and golang-rod.

[lino-levan]

Ah right, forgot to update the docs after this pr. I would love to see what you come up with.