Configure external links in ScalaDoc

[Atry]

Like what we did in milessabin/shapeless@e1a620d

[codecov-io]

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[non]

Seems reasonable to me. 👍

Thanks for this! Sorry it had to sit for awhile to get attention.

[ghost]

As per the comment in shapeless milessabin/shapeless@e1a620d , it also looks to me that setting "autoAPIMappings := true should work just fine."

For example https://www.javadoc.io/doc/org.typelevel/alleycats-core_2.11/0.1.7 the links to Bimonad and Try are fine.

But....Set is not OK in https://static.javadoc.io/org.typelevel/alleycats-core_2.11/0.1.7/index.html#alleycats.std.list$

But this is from export-hook, so... paging @milessabin 😄

[Atry]

Scaladoc sometimes does not create link to type aliase