feat: add copy button for code blocks

[Yatharth-coding]

What this PR does

Adds a copy-to-clipboard button for all code blocks across the website.

Details

• Automatically adds a copy button to <pre><code> blocks
• Uses the modern Clipboard API
• Provides visual feedback on successful copy
• Does not affect existing layout or content

Testing

• Tested locally using hugo server
• Verified copy functionality on multiple pages with code blocks

[Darshan-upadhyay1110]

Hi @Yatharth-coding,

Welcome to the community, and thank you for implementing the copy code feature. It is a much needed improvement.

I think we can refine it a bit further. Could you please take a look at the behavior shown in the video and see if we can adjust it accordingly?

Also, in a few cases the icon overlaps with the content. Maybe we could slightly reduce the icon size, or explore another approach to prevent overlapping. I am open to suggestions, as long as the content remains clearly visible.

Looking forward to your thoughts.

Screencast.from.2026-02-18.18-19-34.webm