[Doc] embedding skeleton-test-pattern.svg file

[tossnet]

Pull Request

📖 Description

In the BlazorFluentUI documentation for the Skeleton component, the skeleton-test-pattern.svg file referred to an external Fast Fluent url that no longer exists.

🎫 Issues

embedding skeleton-test-pattern.svg file into FluentUI.Demo.Shared/wwwroot/images/ and update example

👩‍💻 Reviewer Notes

📑 Test Plan

✅ Checklist

General

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

Component-specific

• I have added a new component
• I have added Unit Tests for my new component
• I have modified an existing component
• I have validated the Unit Tests for an existing component

⏭ Next Steps