Add base url config option for hot-reloading

[Mubelotix]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

Describe the solution you'd like

This is what is currently implemented for HydrationScripts

<HydrationScripts options=leptos_options.clone() root="https://code.mub.lol/proxy/3000"/>

I need the same root argument thing for AutoReload

Describe alternatives you've considered

Not using auto-reload.

Additional context

This is where the base url must be inserted

leptos/leptos/src/hydration/reload_script.js

Line 2 in a1f5d6f

let ws = new WebSocket(`${protocol}${host}:${reload_port}/live_reload`);

The same thing already exists for the protocol. It would be an easy PR, if that's convenient for you I can make it, but I need confirmation it would get merged

[gbj]

Sure, a PR is welcome.