Optimize and clean up GitHub Help Documentation YAML config for better maintainability

[NirajDN]

Why:

This PR improves the maintainability and clarity of the GitHub Help Documentation YAML configuration by removing duplicate redirects, organizing navigation, and improving formatting. These changes help contributors better navigate and maintain the docs config.

Closes: N/A (no existing issue; this is an optimization and cleanup)

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

• Removed redundant redirect entries from the redirect_from list to reduce clutter.
• Grouped and sorted redirects and navigation children for readability.
• Added comments to the YAML to aid future maintenance.
• Improved formatting and indentation consistency.

These changes are entirely behind the scenes in the YAML configuration file that controls the docs navigation and redirects.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• 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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