refactor: improve separation of source / output paths in config

[james-elicx]

Context
Source and output paths are currently mixed in the config with no clear distinction

Changes

• Restructures config types into separate objects for source paths vs output paths vs internal paths.

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Latest commit: 807dd0a

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commit: 807dd0a

[dario-piotrowicz]

Looks good to me 🙂

Especially since you reverted the change @vicb commented about, since that's not an issue here I think the PR shouldn't really be controversial at this point 🙂

But we do have an issue there in the sense the CLI fails to build in skip-build mode if no .next folder exists. @james-elicx could you open an issue for that so we can keep track of it? 🙂