addition of light and dark mode toggle button

[Jagpreet Singh Khurana]

I would be adding this button using HTML ,CSS ,JS
Kindly assign this task to me under GSSoC'24

[Janit Kumar]

assign me this issue

[newcodergit]

Please assign this task to me under GSSoC'24.

[ksuveda2006]

i would love to contribute to this , please assign me this task , mail : [e-mail]

[Jagpreet Singh Khurana]

@RituKumari98 please respond to this issue