chore: clean-up showcase

[Shane-Donlon]

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Description

Checklist

• [x ] I made corresponding changes to the Qwik docs

Hey there,

Just done some manual verification of sites on the showcase page https://qwik.dev/showcase/
Seems that https://reduced.to/ & https://promptle.art/ are no longer valid.

Assets have been removed from Public also.
Just a little bit of house cleaning 😃

[changeset-bot]

⚠️ No Changeset found

Latest commit: ca5e992

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[github-actions]

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⚡ Cloudflare Pages Deployment

Name	Status	Preview	Last Commit
qwik-docs	✅ Ready (View Log)	Visit Preview	ca5e992

[Shane-Donlon]

Preview self-review, seems fine!

https://shane-donlon-chore-clean-up.qwik-8nx.pages.dev/showcase/

[gioboa]

Thanks @Shane-Donlon you rock 👏