Migrate Gatsby to Astro

[google-labs-jules]

Migrated the entire Gatsby site to Astro. This included:

• Initializing an Astro project with React, Tailwind, and MDX integrations.
• Porting the main layout (Layout.astro) and components (VideoOverlay).
• Migrating global styles from SCSS.
• Creating dynamic routes for blog posts using [...slug].astro and import.meta.glob.
• Recreating static pages (Index, About, Contact, 404, Uses).
• Moving static assets to the public directory.
• Ensuring URLs are preserved using the permalink frontmatter.
• Fixing deprecation warnings and ensuring a clean build.

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PR created automatically by Jules for task 16235244142150450231 started by @ptasker

[google-labs-jules]

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