fix: remove broken Balanced Chef theme link from Sanity page [i18nIgnore]

[McVyp]

Description (required)

The Balanced Chef theme card on the Sanity CMS guide links to
https://astro.build/themes/details/the-balanced-chef/ which returns a 404.

Removed the broken theme card and now-unused imports.

Related issues & labels (optional)

• Suggested label: improve or update documentation

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File	Note
en/guides/cms/sanity.mdx	Source changed, localizations will be marked as outdated.
es/guides/cms/sanity.mdx	Localization changed, will be marked as complete.
fr/guides/cms/sanity.mdx	Localization changed, will be marked as complete.
ko/guides/cms/sanity.mdx	Localization changed, will be marked as complete.
pt-br/guides/cms/sanity.mdx	Localization changed, will be marked as complete.
zh-cn/guides/cms/sanity.mdx	Localization changed, will be marked as complete.

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[yanthomasdev]

Thanks @McVyp, can you also delete the astro-chef-project.png image?

[McVyp]

@yanthomasdev
Found that the image is also referenced in the translated pages (es, fr, ko, pt-br, zh-cn), so I'll remove it from those too and delete the image file.

[yanthomasdev]

LGTM! Thanks!