Fix broken linkes on widgets in README.md

[vezdeneszter]

Fixing links on readme widgets

Checklist:

• I have read and followed the contribution guideline.
• I have checked to ensure there aren't other open Pull Requests for the same update/change
• I have tested these changes and added tests that prove my fix is effective or that my feature works
• I have made corresponding changes to the documentation
• New and existing unit tests pass locally with my changes
• 100% unit test coverage achieved

Related Issue

Closing: DEM-185

Type Of Change

• Documentation update

Description

Fixed broken links on widgets (git issues, git tags, discord)