docs: remove broken link to action-plugin-update

[Shekhar0109]

Documentation Update: Remove Broken Link to action-plugin-update

IMPORTANT: Please do not create a Pull Request without creating an issue first.

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Types of changes

What types of changes does your code introduce to the project?

• Bugfix (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)
• Documentation Update

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Details

• Removed the broken link to rtCamp/action-plugin-update in:
  • REPO-SETUP-GUIDE.md
  • SKELETON-GUIDE.md
• The workflow explanations remain intact.

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Checklist

• Lint and tests pass locally with my changes (if applicable)
• I have added necessary documentation (if appropriate)

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Further comments

This is a small documentation-only fix. No code changes were made.

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Closing issues

Closes #32