ci: update showcase (#1853)

Co-authored-by: Chris Swithinbank <[email protected]>

Author: astrobot-houston

src/content/showcase/awexr.mx.webp

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+title: AWE MX
+image: ./awexr.mx.webp
+url: https://awexr.mx/
+dateAdded: 2025-09-29T12:31:52.119Z

src/content/showcase/awexr.mx.yml

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+title: Genkit - One framework for building, debugging, and deploying AI-powered apps
+image: ./genkit.dev.webp
+url: https://genkit.dev/
+dateAdded: 2025-09-29T12:32:07.783Z
+categories:
+  - starlight

src/content/showcase/genkit.dev.webp

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+title: Git Diff Viewer
+image: ./git-diff-viewer.trueberryless.org.webp
+url: https://git-diff-viewer.trueberryless.org/
+dateAdded: 2025-09-29T12:32:50.267Z

src/content/showcase/genkit.dev.yml

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+title: Learn To Read
+image: ./learntoread-astro.netlify.app.webp
+url: https://learntoread-astro.netlify.app/
+dateAdded: 2025-09-29T12:32:01.073Z

src/content/showcase/git-diff-viewer.trueberryless.org.webp

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+title: Astro.js Website Inspiration Gallery | NebulaSites.xyz
+image: ./nebulasites.xyz.webp
+url: https://nebulasites.xyz/
+dateAdded: 2025-09-29T12:31:55.282Z