Update index.md

[dsolovay]

Fix broken link for User Guide

User Guid link is a 404

Description / Motivation

N/A

How Has This Been Tested?

Yes

Types of changes

Link change

• [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 change)
• [ ] Documentation update (non-breaking change; modified files are limited to the /data directory or other markdown files)

Checklist:

• [ ] I have read the Contributing guide.
• [ ] My code/comments/docs fully adhere to the Code of Conduct.
• [ ] My change is a code change.
• [x] My change is a documentation change and there are NO other updates required.
• [ ] My change has new or updated images which are stored in the /public/images folder that need to be migrated to Sitecore DAM

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