[next]: Add Astro kitchen-sink example, which includes data fetching and preview

[ahuseyn]

Description

This PR adds a kitchen-sink example for Astro to include all the available features (template-hierarchy, previews, data-fetching). It'll be the working ground for future development.

Related Issue(s):

• [experimental]: Create kitchen-sink Astro example  #2157

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Latest commit: ade3e11

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