marimo data catalog: use cleaner syntax

[Light2Dark]

Summary

We can use the create_if_not_exists method instead for cleaner syntax.

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[windsurf-bot]

Looks good to me 🤙

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PR Change Summary

Refactored the data catalog documentation to utilize cleaner syntax by implementing the create_if_not_exists method.

• Replaced the use of NamespaceAlreadyExistsError with a cleaner method for namespace creation.
• Updated the catalog namespace creation logic for improved readability.

Modified Files

• src/content/docs/r2/data-catalog/get-started.mdx

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