Adding Bootstrap docs

[Divyapahuja31]

📋 Pull Request Description

What does this PR do?

This PR adds a comprehensive Bootstrap guide under the docs/ui/ directory, covering essential Bootstrap components, layout techniques, utilities, and best practices for building responsive and modern web interfaces.

Type of Change

• 📝 New documentation
• 📚 New topic/section

Changes Made

• Added bootstrap.md — A detailed guide with practical examples, tips, and patterns for using Bootstrap effectively in UI development

Documentation Location

• Folder: docs/ui/
• Files added:
  • bootstrap.md

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✅ Checklist

General

• My content follows the style guidelines of this project
• I have performed a self-review of my own content
• Markdown formatting is correct
• No warnings or build errors

Documentation

• All examples tested and working
• Code snippets include clear explanations
• File naming follows conventions
• Beginner-friendly yet comprehensive

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🧪 Testing

Test Results

• ✅ Tested locally
• ✅ All examples render correctly
• ✅ No formatting or build issues found

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📚 Additional Context

This addition introduces Bootstrap guidance to the devdocx project, complementing existing frontend topics like CSS, Tailwind, and React UI components.
It helps users learn layout systems, components, utilities, and responsive design patterns through well-structured, example-rich markdown files.

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🎃 Hacktoberfest

• ✅ This PR is part of Hacktoberfest 2025
• ✅ I have read and followed the Contributing Guidelines
• ✅ I have read and agree to the Code of Conduct

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📝 Note to Reviewers

Please review for markdown consistency, code clarity, and completeness of the Bootstrap examples.

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📝 Before Merging

• Documentation is clear and accurate
• Code examples work correctly
• No typos or grammatical errors
• Follows project structure and conventions