Create Top 10 Pipelines traffic leaderboard

Follow-up from PR #52, related to parent issue #61

Feature request

Add a dedicated "Top 10 Pipelines" leaderboard section to the Repository Traffic page.

Requirements

1. New leaderboard section

• Filter to show only pipeline repositories (exclude core repos)
• Show top 10 by total views
• Display columns:
  • Pipeline name (with link)
  • Total Views
  • Unique Views
  • Total Clones
  • Unique Clones
  • Stars

2. Data filtering

• Use category = 'pipeline' or similar filter
• Exclude all core repositories (tools, website, etc.)
• Sort by total views descending

3. Placement

• Add as a new section after the existing Repository Traffic Leaderboard
• Consider making it collapsible or in a tab

Acceptance criteria

• New "Top 10 Pipelines" section appears on Repository Traffic page
• Only pipeline repositories are shown (no core repos)
• Table shows the specified metrics
• Pipelines are sorted by total views
• Pipeline names link to their GitHub repos

Start with the Repository Traffic page and its existing Repository Traffic Leaderboard, then review PR #52 and parent issue #61 for the current implementation context. Add a Top 10 Pipelines section using the pipeline category filter, required metrics, repository links, and total-views sorting; done means only pipeline repositories appear with all specified columns.