Fix sidebar overlapping main content by making width responsive

[sunil5151]

Problem

The sidebar on the React documentation had a fixed width, causing it to overlap the main article content on certain screen sizes.

Solution

Changed the sidebar's CSS width from a fixed value to auto/responsive so that it no longer overlaps the main content.

Result

• Sidebar now adjusts dynamically based on screen size.
• Main article content is fully visible.
• Layout is responsive and works on all screen widths.

Fixes: #<7976>

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[sunil5151]

PLease tell me what is issue , please i want to solve the problem but i just dont know about it