Integration of the pagination component to the doc site

[sc-ishankalakshan]

Summary

Implemented pagination component in both the registry and demo directories.
This adds consistent UI and demo usage for pagination across the project.

Changes

• Implemented pagination component in src/components/ui/pagination.tsx
• Created demo component for pagination in src/app/demo/[name]/ui/pagination.tsx
• Add the demo pagination component to the index file to show in the site in src/app/demo/[name]/index.tsx
• Tested the pagination component locally.

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