docs(getting-started): update `ChakraBaseProvider` example

[TylerAPfledderer]

Fix the ChakraBaseProvider example where the import of the default theme is not a named export.

Related issue(s)

• https://github.com/chakra-ui/chakra-ui/issues/8108
• https://github.com/chakra-ui/chakra-ui-docs/issues/1481

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Name	Status	Preview	Updated (UTC)
chakra-ui-docs	✅ Ready (Inspect)	Visit Preview	Nov 12, 2023 2:50am