Recommend installation in `docs` Project.toml? about documenter.jl HOT 4 OPEN

There's nothing in progress right now, so adding a note right now would be good I think -- it would also act as reminder to emphasize this during the rewrite.

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Related to #2321. In general, yes, I think we expect the users to add Documenter to their local environment, likely under the docs/ directory in their package. So adding at least a small note about that would probably be good, although I feel that a good solution is to re-think the whole getting started guide.

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Thanks - I guess it then comes down to the question of how likely is it that this rewrite happens reasonably soon? Mentioning docs/ could be a 15 minute PR which might help people immediately with quite a fundamental first step, but I also get the point about not wanting to tinker with things now if everything gets rewritten soon.

from documenter.jl.

Ok. here's a first attempt:

#2429

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