Remove duplicate "#### Free Resources" sections from index.mdx files

[Copilot]

This PR addresses the duplicate entries found under the '#### Free Resources' heading in multiple index.mdx files throughout the documentation.

Problem

Many index.mdx files contained duplicate "#### Free Resources" sections:

• First section: Contained specific topic-related links
• Second section: Contained generic tabbed interface template

This duplication reduced documentation clarity and created inconsistency across the learning materials.

Solution

Systematically removed the first "#### Free Resources" section while preserving the second section with the standardized tabbed interface. The fix involved:

1. Pattern Detection: Identified 131 files with duplicate sections across different heading patterns
2. Automated Cleanup: Created scripts to safely remove duplicates while preserving content structure
3. Standardization: Ensured all files now use the consistent tabbed interface format

Example

Before:

#### Free Resources

- [@official@Git branch documentation](https://git-scm.com/docs/git-branch)
- [@article@Git branch](https://www.atlassian.com/git/tutorials/using-branches)

#### Free Resources

<Tabs defaultValue="official">
<TabsList>
<TabsTrigger value="official">Official Docs</TabsTrigger>
<!-- ... -->
</TabsList>
</Tabs>

After:

#### Free Resources

<Tabs defaultValue="official">
<TabsList>
<TabsTrigger value="official">Official Docs</TabsTrigger>
<!-- ... -->
</TabsList>
</Tabs>

Impact

• 131 files updated with duplicate sections removed
• Consistent documentation structure maintained across all learning materials
• Improved readability for beginners learning Git
• No functional changes - all builds and linting pass successfully

This cleanup maintains the beginner-friendly nature of the documentation while ensuring a professional, consistent presentation throughout the learning platform.

Fixes #235.

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