feature: dark mode

[dnyandeepchute]

there will be a field(symbol) on right top corner for changing the mode of web to dark and again back to normal.

useful for the user as it help the user to use it and see content in better way and also useful for website as it gives a different look and experience.

using dark mode help user to- Reduces eye strain Gives a productivity boost Saves battery life

[dnyandeepchute]

hey @Rajan-Barnwal , please assign this to me, thank you.