[Gssoc'21] Add a confirmation alert before logging out

[arpit456jain]

Is your feature request related to a problem? Please describe.

some time user clicks on logout by mistake and if dark mode is added it will contain a toggle button and the possibility of clicking logout by mistake will increase /

I would like to make a confirmation alert like this

Describe the solution you'd like

• A clear and concise description of what you want to happen.

[arpit456jain]

@CodesbyUnnati @khannakshat7 can i start working on this?

[arpit456jain]

I am on it

[arpit456jain]

@khannakshat7 kindly review my PR and add these labels to it.

and please review My PR for feedback