Add parameterized pipeline detail pages for traffic data

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

Feature request

Create individual detail pages for pipelines showing their specific traffic patterns and metrics.

Implementation approach

1. Parameterized routing

• Create a route like /code/pipelines/[pipeline_name]/traffic
• Use Evidence's parameterized pages feature
• Link from the main traffic leaderboard and Top 10 list

2. Pipeline-specific visualizations

• Show traffic trends for individual pipeline
• Include:
  • Views and clones over time (line/area charts)
  • Daily heatmap of activity
  • Comparison to nf-core averages
  • Release markers on timeline
  • Top referrers (if available)

3. Navigation

• Add links from leaderboard tables to detail pages
• Include breadcrumb navigation
• Add "View detailed traffic" button/link

Acceptance criteria

• Parameterized pages work for any pipeline name
• Detail pages show pipeline-specific traffic data
• Navigation from leaderboard to detail pages works
• Charts are properly filtered to show only selected pipeline data
• Page handles non-existent pipelines gracefully

Start with PR #52 and parent issue #61, then review the existing traffic leaderboard and Top 10 list. Use Evidence's parameterized pages feature for /code/pipelines/[pipeline_name]/traffic, and treat the acceptance criteria as done: filtered charts, working navigation, and graceful handling of non-existent pipelines.