add missing customComponents prop to page content in nextjs-app-dir-v2 example

[nerdyman]

Description

The nextjs-app-dir-v2 example has a registry module but doesn't pass the custom components to the Content component so they never show in the Builder UI which caught me out.

This adds the customComponent prop to the Content, allowing custom component to now render in the Builder UI.

[changeset-bot]

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Latest commit: ea7a064

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