Change the name of the Interactivity API quick start guide markdown file

[juanmaguitar]

What?

Change the name of the Interactivity API quick start guide markdown file

Why?

For some reason the Quick Start Guide of the Intereactivity API meant to be at "Block Editor Handbook > Reference Guides > Interactivity API Reference > Quick Start Guide" (se toc.json) has been created at https://developer.wordpress.org/block-editor/getting-started/quick-start-guide/ (replacing the former one) and the url https://developer.wordpress.org/block-editor/reference-guides/interactivity-api/quick-start-guide/ redirects there (edited)

I seems we cannot have two pages with the same name even when they're located at different paths

[github-actions]

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[github-actions]

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Co-authored-by: juanmaguitar <juanmaguitar@git.wordpress.org>
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[ndiego]

LGTM 🚢