refactor: remove relative onyx imports from docs

[larsrickert]

We were currently using direct/relative imports for onyx components used in our VitePress docs. This required custom Vite/tsconfig options and might not be intuitive for new/External contributors taking a look at our codebase.

With our turbo repo setup, we can easily import directly from sit-onyx and turbo repo will make sure to build the components first. Like this our docs is just a regular consumer of the sit-onyx package, just like our playground and demo app.

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Latest commit: 80433a3

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