Add a warning that actors are part of an obsolete API

[jakzal]

It's not clear from the documentation that Actors are part of an obsolete API.

re #87

[qwwdfsad]

Thanks!

We'd prefer not to mention the issue and overall direction we are not working towards though. Independently on #87 state, current actors are obsolete and underdesigned

[jakzal]

Thanks for taking a look.

I just wanted to save others from disappointment who like myself might read the docs and get excited by the prospect of having built-in support for actors. Only to learn later the API is obsolete and not worth using. 🤷

[qwwdfsad]

Thanks for the feedback!

It indeed looks odd, instead, I've filed #3785 to avoid such situations