Add links to Kibana docs

[dedemorton]

Closes #180

[tbragin]

LGTM!

[tbragin]

Looks good to me. Jumping around is unfortunate, but I can see why it's necessary within our docs structure today. It would be nice to have ability to duplicate key snippets, such as specifically how to customize Logs UI and Infrastructure UI index configuration right inline.

[dedemorton]

It would be nice to have ability to duplicate key snippets, such as specifically how to customize Logs UI and Infrastructure UI index configuration right inline.

@tbragin Agreed. We do have a place in the docs repo where we can store content shared across books, but I've noticed that folks forget to update those files. The files don't show up in a repo search, so maintainers don't think to update them. So I hesitate to use that approach right now. I'd really like us to resolve the larger problem with our information architecture because the fragmentation of content is pervasive and not a great user experience. Having our content in silos organized by product is a legacy problem that's going to take a concentrated effort and investment to resolve. :-/ I'm looking forward to talking more with you about the issue, especially wrt the observability and beats docs.

[DanRoscigno]

LGTM