fix(ci): add missing github-token to markdown-link-check action

[asielcabrera]

The gaurav-nelson/github-action-markdown-link-check action requires github-token as input. Also removed the reference to the non-existent .github/markdown-link-check.json config file.

Summary

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Other (please describe):

Breaking Changes

• This PR does NOT contain breaking changes
• This PR contains breaking changes (describe below)

Breaking changes description:

Testing

• :checkhealth swift
• Manual testing details:
• Added or updated tests (if applicable)

Documentation

• Not needed
• Updated DOCUMENTATION.md, GETTING_STARTED.md, or other guides
• Updated README.md
• Updated code comments

Checklist

• Linked related issues or discussions (Fixes #123, Closes #456)
• Added or updated examples when behavior changes
• Verified backward compatibility or documented breaking changes
• Code follows the project's style guidelines
• Commits are rebased on latest main with clear messages
• Requesting review once the PR is ready (not a draft)