Add global contributor leaderboard based on total GitHub/GitLab contributions

[Notoriousbrain]

Summary

Introduce a Global Leaderboard feature that ranks all OSSdotnow users by their total number of contributions across connected GitHub and GitLab projects.

Motivation

Showcase top contributors in the OSSdotnow community

Encourage healthy competition and increased engagement

Surface user impact at a glance

Features

A new “Leaderboard” page linked in the main navigation

Table with the following columns:

Rank

Avatar and username

Total contributions (all platforms combined)

GitHub contributions count

GitLab contributions count

Sorting options for each column

Filtering by time period: all-time, last 30 days, last year

Automated daily refresh of contribution counts

Responsive design for desktop and mobile views

[ahmetskilinc]

Hey, any update? @Notoriousbrain

[Notoriousbrain]

Yea, Ive wrote the leaderboard logic and I have started working on the UI part

[bzstable]

@Notoriousbrain is this done?

[Notoriousbrain]

yes, its even in draft pr

[bzstable]

alr