Feat: Add GitHub Action to check for broken links

[MayankRaj435]

Closes #1786

Description

This pull request adds a new GitHub Action workflow to automatically check for broken or outdated links in data.json.

Key Features:

• Runs on a weekly schedule (every Sunday at 3 AM UTC).
• Can also be triggered manually for testing.
• Uses the lychee-action to efficiently scan all URLs in data.json.
• The workflow will fail if it finds any broken links, making it easy for maintainers to spot problems.

This helps automate repository maintenance and ensures the quality of the resource list for beginners, as requested in issue #1786.