fixed link validation

[DpkTewatia]

fixed link validation

Description

There is issue in CSS link. on homepage https://microsoft.github.io/Web-Dev-For-Beginners/#/

Fixes # (issue)

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

[saragibby]

@DpkTewatia this PR has a conflict. Once you resolve the conflict we can get this merged.

[github-actions[bot]]

This PR has not seen any action for a while! Closing for now, but it can be reopened at a later date.