Adding Light/Dark toggle mode

[harikasayani]

Is your feature request related to a problem? Please describe.
I observed that there is no toggle button in web page

Describe the solution you'd like
I want to add it.

Additional context
I am GSSOC'24 Contributor.
Please assign me this task.

[github-actions]

Hi there! Thanks for opening this issue. We appreciate your contribution to this open-source project. We aim to respond or assign your issue as soon as possible.

[SUGAM-ARORA]

@harikasayani Issue assigned to you

[agarwalhimanshugaya]

If no one working on this issue please assign me this issue under Gssoc'24 i loved to solve this problem