Add comprehensive Trees module documentation

[Srishti-Gupta74]

Related Issue

Related to #13

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Description

Added comprehensive Trees module documentation for the Data Structures using C course content.

Changes Made

• Added introduction to Trees and their characteristics
• Added tree components, terminology, and representation
• Added degree, depth, height, and level explanations with examples
• Added various tree types including Binary Trees, BSTs, AVL Trees, and B-Trees
• Added detailed coverage of tree traversal techniques (DFS and BFS)
• Added Preorder, Inorder, Postorder, and Level Order traversal explanations and examples
• Added tree operations including search, insertion, deletion, height calculation, and node counting
• Added Binary Search Tree concepts and implementations in C
• Added complexity analysis for traversals and tree operations
• Added practical applications, advantages, limitations, and real-life examples
• Added interview questions for revision and practice
• Updated the course contents page to reflect the expanded Trees module topics

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Type of Change

• Bug fix
• New feature
• Documentation update
• UI/UX improvement
• Refactor

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Screenshots / Demo

Content Page Updated

Trees Module Page

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How Has This Been Tested?

• Ran npm run lint successfully (no errors)
• Ran npm run build successfully
• Verified the Trees module renders correctly in the browser
• Reviewed all content for accuracy and consistency with existing modules
• Confirmed navigation and content structure work as expected

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Checklist

• My code follows the project structure and conventions
• I have tested the changes locally
• I have linked the related issue properly
• I have added screenshots where applicable
• No existing functionality was broken

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AI Usage

• I have not used AI tools for this contribution

• I have used AI tools (ChatGPT, Copilot, Claude, etc.) and I have reviewed, verified, and understood all generated code/content before submitting this PR

If AI tools were used, briefly explain how:

AI tools were used to assist with drafting and organizing educational content, improving explanations, reviewing documentation structure, and identifying potential inconsistencies. All generated content was manually reviewed, verified, edited, tested, and validated before submission.

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Additional Notes

This PR significantly expands the Trees module to provide a more comprehensive learning resource for students. The content includes conceptual explanations, C implementations, complexity analysis, practical examples, and interview-oriented questions while maintaining consistency with the existing course structure.

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