docs(react-card): remove ASSET_URL export to fix codesandbox examples

[marcosmoura]

Current Behavior

By exporting a ASSET_URL, the codesandbox examples were not loading.

New Behavior

Remove export and use a static variable instead

Related Issue(s)

Fixes #24793

[codesandbox-ci[bot]]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 64bf295e714f98c08d18e602cdeddbd77cdf2e69:

Sandbox	Source
@fluentui/react 8 starter	Configuration
@fluentui/react-components 9 starter	Configuration

[size-auditor[bot]]

Asset size changes

Size Auditor did not detect a change in bundle size for any component!

Baseline commit: 48d8c5c16b5367a3dfd295391512984051bbe727 (build)

[fabricteam]

📊 Bundle size report

Unchanged fixtures

Package & Exports	Size (minified/GZIP)
react-card Card - All	67.002 kB 19.261 kB
react-card Card	62.684 kB 18.177 kB
react-card CardFooter	8.561 kB 3.601 kB
react-card CardHeader	9.604 kB 3.94 kB
react-card CardPreview	8.662 kB 3.656 kB
react-components react-components: Accordion, Button, FluentProvider, Image, Menu, Popover	188.689 kB 52.37 kB
react-components react-components: FluentProvider & webLightTheme	33.394 kB 11.007 kB
react-portal-compat PortalCompatProvider	5.851 kB 1.964 kB

_{🤖 This report was generated against 48d8c5c16b5367a3dfd295391512984051bbe727}

[fabricteam]

Perf Analysis (@fluentui/react-components)

No significant results to display.

All results

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
Avatar	mount	1324	1314	5000
Button	mount	955	953	5000
FluentProvider	mount	1588	1589	5000
FluentProviderWithTheme	mount	629	637	10
FluentProviderWithTheme	virtual-rerender	582	586	10
FluentProviderWithTheme	virtual-rerender-with-unmount	629	633	10
MakeStyles	mount	1887	1869	50000
SpinButton	mount	2595	2521	5000