added pagination to repositories list to optimize DOM rendering

[mihirkamat03]

Summary of Changes

• Implements a paginated view in pages/index.vue showing 20 repositories per page (itemsPerPage = 20).
• Adds responsive Previous/Next pagination buttons with disabled states and page counters.
• Adds smooth window scrolling (window.scrollTo) when navigating between pages.

Motivation & Performance Impact

As generated.json grows in size, rendering all repository <RepoBox> components simultaneously causes excessive DOM nodes and UI lag on mobile devices. Slicing the repository array into pages optimizes initial rendering performance and improves browsing UX.

Verification

• Verified clean build and local rendering via bun dev.
• Tested pagination state on first and last pages.

[vercel]

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