docs(scripting): fix broken stackblitz logo image reference

Removed reference to non-existent /imgs/stackblitz-logo.png that was
breaking the vite/rollup build. The Live Example section now uses a
plain text link to Stackblitz.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Claude

documentation/how-to-guides/scripting/load-3d-web-assets-at-runtime.md

@@ -211,7 +211,7 @@ If a load fails, open the browser DevTools Network tab — most external-URL iss
 
 Try it in your browser — the example below uses `SceneSwitcher.addScene()` with several Needle Cloud URLs. Swap them for your own to test:
 
-[![Stackblitz: load scenes from URLs](/imgs/stackblitz-logo.png) Open on Stackblitz](https://stackblitz.com/edit/needle-engine-vite-template)
+[Open on Stackblitz](https://stackblitz.com/edit/needle-engine-vite-template) — uses `SceneSwitcher.addScene()` with several Needle Cloud URLs.
 
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