fix(core): update favicon (#12581)

not changing the favicon.ico file to make sure the change will be updated on the user's browser to get rid of caching

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **Style**
  - Updated the favicon URL across the application and link previews to include a version query parameter (`?v=2`) for better cache control.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/core/doc-renderer/controller.ts

@@ -178,7 +178,7 @@ export class DocRendererController {
     <link rel="manifest" href="/manifest.json" />
     <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
     <link rel="icon" sizes="192x192" href="/favicon-192.png" />
-    <link rel="shortcut icon" href="/favicon.ico" />
+    <link rel="shortcut icon" href="/favicon.ico?v=2" />
     <meta name="emotion-insertion-point" content="" />
     ${!opts ? '<meta name="robots" content="noindex, nofollow" />' : ''}
     <meta