Added feature to watch videos

[ChaitanyaEmani]

Related Issue

Description

This PR introduces a dedicated "Video Lectures" module in LearnHub to allow educators to upload and manage video content, and learners to watch lectures directly from the platform.

Fixes #186

Type of PR

• Feature Enhancement

Screenshots / videos (if applicable)

Checklist:

• Displays a list of educational video lectures from a predefined dataset (Videolectures.js).
• Allows filtering videos by category through a dropdown menu.
• Persists the selected category using localStorage so that refreshing the page retains the filter.
• Shows a "No videos available in this category" message if no matches are found.

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[github-actions]

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[github-actions]

🎉🎉 Thank you for your contribution! Your PR #209 has been merged! 🎉🎉