Added dark mode to Contact page

[isid555]

Fixes Issue🛠️

Closes #1894

Description👨‍💻

This PR introduces dark mode support to the Contact page, improving user experience for those who prefer a dark interface or use the website in low-light environments. It includes a toggle option to switch between light and dark modes and ensures proper color adjustments for all elements.

Type of Change📄

• Style (non-breaking change which improves website style or formatting)

Checklist✅

• I am an Open Source contributor
• I have performed a self-review of my code
• My code follows the style guidelines of this project
• I have commented on my code, particularly in hard-to-understand areas

Screenshots/GIF📷

##In light mode

In dark mode

[github-actions]

Hey @isid555, Welcome to the project CalcDiverse! 🎊
Thanks for your contribution! Your effort makes this project better. Keep it up! 🙌
Please wait for the PR to be reviewed. Happy Coding!! ✨

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[Rakesh9100]

No major change is seen, you can improve more by changing the color of Contact Us heading and Message Count text color as it is not visible properly when theme is changed @isid555

[isid555]

Yep I have mistakenly made CONTACT page update in the prev commit.....
Fine ...Ill make suitable Changes @Rakesh9100

[Rakesh9100]

Any update @isid555

[isid555]

I have made the required changes , Kindly review it @Rakesh9100

[github-actions]

Congrats, Your pull request has been successfully merged 🥳🎉 Thank you for your contribution to my project 🚀 Keep Contributing!! ✨ @isid555