Replace externally hosted homepage media with local assets

[Copilot]

The homepage referenced multiple externally hosted images, which triggered resource load failures in some client environments (ERR_NAME_NOT_RESOLVED / blocked fetches). This PR removes those external dependencies from the main page render path.

• Homepage hero/slideshow asset sourcing

  • Replaced slideshow image URLs in src/App.tsx that pointed to github.com/user-attachments/... with local files already served from /public.
  • Updated the hero logo image source from an external GitHub asset to a local site asset (/favicon.svg).

• Net effect

  • Main-page visual assets now resolve from the app origin, reducing third-party fetch failures and removing brittle external hostname dependencies.

const slideshowImages = [
  "/Skateboards in space.png",
  "/Skateboards in space2.png",
  "/hype-BA.png",
  "/Joustur-board.png",
];

<img className="placeholder-logo" src="/favicon.svg" ... />

[Copilot]

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