Linux support

[lloydsargent]

Thanks!

[jpsim]

No, Jazzy uses SourceKit & SourceKitten for extracting documentation information from Swift source, and neither of them are available on Linux yet.

[refi64]

Both SourceKit and SourceKitten work on Linux. Can this be reopened?

[jpsim]

Sure.

[SDGGiesbrecht]

Much, but not all, of #487 (Use Without Xcode) is very relevant to Linux support.

@kirbyfan64, you could have a look there an see if you can get something working.

[refi64]

Looks like it's mostly usable using @jpsim's workflow in #487:

$ sourcekitten doc --spm-module Module > doc.json
$ jazzy ... --sourcekitten-sourcefile doc.json

So at this point, this is just #487 I guess? (It's worth noting anyway that Jazzy's vendored sourcekitten binary is for macOS, but that doesn't matter right now since it's only used for xcodebuild anyway...)