feat: added web development & dsa roadmap pages with sidebar updates

[tailormst]

Related Issue

Fixes #242

Description

Added Web Development Roadmap and DSA Roadmap pages based on the requested feature.

This update includes:
New web-development/roadmap.md page
Added roadmap links for Frontend, Backend, and Full Stack
Updated sidebar to display the new roadmap pages
Ensures the learning paths are clear and organized
Structure is similar to the existing DSA roadmap format
This enhances the documentation and helps learners follow a proper visual learning path.

Type of PR

• [ x ] Bug fix
• Feature enhancement
• Documentation update
• Other (specify): _______________

Screenshots / videos (if applicable)

Checklist:

• [ x ] I have made this change from my own.
• [ x ] I have mentioned the issue number in my Pull Request.
• [ x ] I have gone through the CONTRIBUTING.md file before contributing
• [ x ] I have performed a self-review of my own code.
• [ x ] I have commented my code, particularly in hard-to-understand areas.
• [ x ] I have made corresponding changes to the documentation.
• [ x ] My changes generate no new warnings.
• [ x ] I have tested the changes thoroughly before submitting this pull request.
• [ x ] I have provided relevant issue numbers and screenshots after making the changes.

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[github-actions]

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