[Feat] Adding a toggle key for dark theme

[ruhilmansi]

Description

Implement a dark mode toggle for better accessibility and usability

[github-actions]

👋 Thank you @vimistify for raising an issue! We appreciate your effort in helping us improve. Our team will review it shortly. Stay tuned!

[github-actions]

👋 Thank you @vimistify for raising an issue! We appreciate your effort in helping us improve. Our team will review it shortly. Stay tuned!

[ruhilmansi]

can you assign this under swoc??