Update sku to v16

[askoufis]

Mostly a straightforward change. The removal of rootResolution from sku config was the only breaking change that affected this repo. Prettier was also updated to align with the version sku depends on.

The only other notable change in v16 is the swap to Lightning CSS for CSS minification. Potential issues with minified output were raised and subsequently resolved in slack a few weeks ago, and I can't find any styling regressions on the docs site.

Incidentally though, it happened to bring up a separate problem with import order linting. It turns out that the presence of a built braid-design-system package, i.e. packages/braid-design-system/dist, affects whether a braid-design-system import is classified as internal or external. This was causing lint to pass locally but fail in CI.

To fix this I configured import-x/internal-regex to always treat braid-design-system as an internal package, which has stabilized the import order.

Updating to v16 is a prerequisite for migrating to Vite, which will be my next PR 🎉

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