Feature/link validation check#1514

[jonaskir6]

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Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Added link-checker for markdown files to workflow #1514

Type of change

Please delete options that are not relevant.

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

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [X] Tested the workflow locally using act-cli (https://github.com/nektos/act)
• A Screenshot of the whole output would be too large:

(There were multiple dead links found in different .md files)

Does This PR Require a Core Repo Change?

• [ ] Yes. - Link to PR:
• [X] No.

Checklist:

See contributing.md for styleguide, changelog guidelines, and more.

• [ ] Followed the style guidelines of this project
• [ ] Changelogs have been updated
• [ ] Unit tests have been added
• [ ] Documentation has been updated