docs: enhance queue module documentation

[Srishti-Gupta74]

Related Issue

Related to #13

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Description

Enhanced the Queue module documentation by improving topic coverage, structure, and overall consistency across the course content.

Changes made:

• Added Queue introduction with FIFO explanation
• Added queue characteristics and components
• Added queue representation section
• Added need for queues section
• Expanded queue operations:
  • Enqueue
  • Dequeue
  • Peek
  • isEmpty
  • isFull
• Added overflow and underflow explanations
• Expanded queue types:
  • Simple Queue
  • Circular Queue
  • Priority Queue
  • Deque
• Improved implementation section:
  • Array implementation
  • Linked List implementation
  • Added missing operation handling
• Added complexity analysis
• Added applications and practical examples
• Added advantages and limitations
• Updated course outline for better consistency across module structure and content organization

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Type of Change

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

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Screenshots / Demo

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How Has This Been Tested?

• Ran the project locally using the development server
• Verified navigation to the Queue module page
• Checked content rendering and formatting
• Ensured all sections displayed correctly without layout or syntax issues

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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:

Used AI tools for reviewing content structure, refining explanations, and improving documentation clarity. All content was manually reviewed, edited, and implemented before submission.

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Additional Notes

This update focuses on improving the learning flow, content organization, and overall consistency of the Queue module with the existing course structure. The changes aim to provide clearer explanations and more complete coverage of core Queue concepts and implementations.

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