[UI framework components] passing Astro content via slot

[sarah11918]

• New or updated content

Adding a section in UI Framework Components page explicitly saying

• you CAN'T import an Astro component inside another framework component
• but you CAN pass an Astro component's static content as children, via a slot

Still working on the wording, but want to get the concept included on this page

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[yanthomasdev]

LGTM, nice work @sarah11918! 🙌