Move contributor leaderboard from GSoC page to organization detail pages

[Copilot]

Per issue comments, moves the GSoC contributor leaderboard to organization detail pages and makes it work for all organizations, not just OWASP.

Changes

Backend (website/views/organization.py)

• Added get_leaderboard_data() method to OrganizationDetailView
• Queries merged PRs since 2024-11-11 across all org repos
• Returns top 10 contributors ranked by PR count
• Uses set tracking to prevent duplicate contributor counting

Frontend (website/templates/organization/organization_detail.html)

• Added leaderboard table after top contributors section
• Shows rank, avatar, username, and merged PR count
• Trophy/medal/award icons for top 3 positions
• Only renders when data exists

Cleanup (website/templates/gsoc.html)

• Removed GitHub issue links labeled as "GSOC 2025/2024 Leaderboard"
• Simplified OWASP Partnership card layout

The leaderboard data structure returned to template:

[
    {
        "contributor": <Contributor>,
        "pr_count": 42,
        "url": "https://github.com/username",
        "username": "username",
        "avatar_url": "https://avatars.githubusercontent.com/..."
    },
    # ... top 10
]

Original prompt

---

This section details on the original issue you should resolve

<issue_title>move the leaderboard from the gsoc page to the organization detail page have it only show on the owasp organization for now</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

@DonnieBLT @rinkitadhana it's essentially to move the same logic on to the organization page you could make it work for all organizations now (no need to restrict it to owasp) and yes to remove it from the gsoc page.

• Fixes move the leaderboard from the gsoc page to the organization detail page have it only show on the owasp organization for now #4050

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