Add repository count indicator to repository list

[Devatva24]

What this PR does

• Adds a repository count indicator above the list of repositories.
• Shows "Showing X of Y repositories" dynamically based on filters applied.
• Improves clarity for users browsing social good projects.

Why is this useful?

• Helps contributors quickly understand how many projects are visible.
• Provides better user experience when filtering by language, topics, or search terms.

Checklist

• Frontend-only change
• No breaking changes
• Code is clean and formatted

[Devatva24]

Hi! 👋
This PR adds a repository count indicator above the repository list.
It's a frontend-only UI improvement with no breaking changes.
Thank you for reviewing!