Add Skeleton component documentation

[elviskahoro]

This pull request adds documentation for the Skeleton component in the library. The new file, skeleton.md, provides an overview of the Skeleton component, which serves as a loading placeholder for content that is not yet available.

The documentation includes:

1. A brief description of the Skeleton component and its purpose.
2. A demo showcasing different uses of the Skeleton component, including:
   • Skeleton placeholders for buttons of different sizes
   • Skeleton placeholders for text elements with loading states
3. Usage tips for implementing Skeleton with text elements.
4. Information on using the loading prop to control the visibility of the skeleton or its children.

This addition will help users understand and implement the Skeleton component in their Reflex applications, improving the user experience during content loading.

[linear]

REF-3558 Document Radix component: Skeleton

[elviskahoro]

• Removing daed Radio Group documentation #864
• Add DataList component to the documentation #863
• Add Skeleton component documentation #862 👈
• Lint plus minor refactor of component_grid function to improve formatting #861
• main

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[Lendemor]

Found a typo I think.

the rest seems fine 👍

[elviskahoro]

Merge activity

• Aug 23, 4:25 PM EDT: @elviskahoro started a stack merge that includes this pull request via Graphite.
• Aug 23, 4:27 PM EDT: Graphite rebased this pull request as part of a merge.
• Aug 23, 4:35 PM EDT: @elviskahoro merged this pull request with Graphite.