Rendering documentation with scaladoc should work offline

[hamdiallam]

Compiler version 3.0.2-RC1

The scaladoc generator requires network access. This is not good for CI machines that run jobs with commands like publishLocal without network access. The exception originates from renderResources here.

Expectation

Ability to generate docs without network access

[smarter]

Looks like scaladoc tries to fetch a few js files: https://github.com/lampepfl/dotty/blob/38b983c1b4a61d4c45f314ae895b95317c322c62/scaladoc/src/dotty/tools/scaladoc/renderers/Resources.scala#L95-L99
Could we instead store these files in the scaladoc jar? We'd have to check their licenses to make sure the result can be redistributed under Apache v2 first. /cc @romanowski

[pikinier20]

3rd party libraries are not fetched during generation. They are included to HTMLs using URL to remote location. The real reason of this exception is fetching Inkuire from Github because Inkuire.js file needs to be locally in generated documentation. The solution is to have inkuire.js packed in scaladoc jar.

[BarkingBad]

We should not require inkuire.js when there is no -Ygenerate-inkuire flag provided, so I think we should fix it there, not by providing inkuire.js to the jar

[smarter]

I think including inkuire.js in the jar would also be fine, although indeed that's less important as long as inkuire is not enabled by default.