feat: add dark theme to the entire website

[mastAk7]

Description

the project earlier was having a dark theme that was applied to just the navbar of only the index.html, i added it to each and every part of every html page in the project

Related Issues

#574
#595
#746
#759
#814
#815
#816

Type of PR

• feature: Adding a dark theme to the entire project

Screenshots / videos (if applicable)

Checklist

• I have gone through the contributing guide
• I have updated my branch and synced it with project main branch before making this PR
• I have performed a self-review of my code
• I have tested the changes thoroughly before submitting this pull request.
• I have provided relevant issue numbers, screenshots, and videos after making the changes.
• I have commented my code, particularly in hard-to-understand areas.

Additional context:

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[github-actions]

Great job, @mastAk7! 🎉 Thank you for submitting your pull request. Your contribution is valuable and we appreciate your efforts to improve our project.We will promptly review your changes and offer feedback. Keep up the excellent work!

[github-actions]

🎉 Your pull request has been successfully merged! 🎉 Thank you for your contribution to our project. Your efforts are greatly appreciated. Keep up the fantastic work! 🚀