Issue 23 create the leaderboard page

[mas-ruk]

Change Summary

Introduces a Leaderboard React component designed to display team rankings within grouped competitions. It includes:

Components:

• Leaderboard
  • Top-level component that renders the List component.

List

• Displays team rankings in a responsive table.
• Includes:
  • A dynamic group selector dropdown to filter by group.
  • Conditional styling for qualified teams.
  • A fallback to mock data for development purposes.
• Accepts a data prop, making it easy to integrate with live backend data.

Change Form

• The pull request title has an issue number
• The change works by "Smoke testing" or quick testing
• The change has tests
• The change has documentation

Other Information

[Is there anything in particular in the review that I should be aware of?]

[allyharrison]

yew! perfect