Add link to beta docs

[k4a-l]

The Beta docs is very useful and should be linked from the main site, even if it is in progress now. Similar comments: https://github.com/reactjs/reactjs.org/issues/3308#issuecomment-1125199765_

I have implemented this experimentally in a forked repository.

• repository
• hosting

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1. adding a link in the header section in parallel with the existing link
2. inserted at the top of Markdown

1 is natural, but it is not so obvious that some people may not notice it. 2 is easy to see, but may be obtrusive since it is inserted on all pages as well. 2 is inserted as a component, but it may be better to just put it in Getting Started markdown.

Anyway, I would like to put the link in any way I can. If you have any good ideas on where to add it, wording, etc., please make suggestions.

[gaearon]

we plan to add a link soon

[k4a-l]

@gaearon Oh, that would be great! I'll leave this issue for now.