Hide navigation in documentation

[cdot65]

Added metadata to hide the navigation on the index page of the documentation. This results in a cleaner layout and prevents distractions for the readers.

Checklist for This Pull Request

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Pull Request Description

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What does this pull request accomplish?

• Feature addition
• Bug fix
• Performance improvement
• Refactoring
• Documentation update
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Are there any breaking changes included?

• Yes
• No

Is there anything the reviewers should know?

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