Optimize and clean up YAML frontmatter to fix redirects and link check errors

[NirajDN]

Why:

This PR addresses the failing CI checks related to redirects and link validation by cleaning up duplicate and outdated entries in the YAML frontmatter of the documentation file.

The previous frontmatter contained multiple duplicate redirects which caused link checker and redirect tests to fail.

What's being changed (if available, include any code snippets, screenshots, or gifs):

• Removed duplicate and unnecessary redirect entries.
• Simplified the YAML frontmatter to follow current GitHub Docs guidelines.
• Ensured links in the frontmatter are unique and valid.

These changes improve the accuracy of redirect paths and fix link validation errors during automated tests.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Table of review links

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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
index.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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