[Feature]: Their Should be one page which is user not found

[anuj-kumary]

Suggest an idea for this project ?

Presently, we redirect users to the contributions page if they enter the wrong username or anything else.

Hence, instead of presenting the contributions page if a new user enters an invalid username, we can display the user not found page.

Please provide an example screenshot

Uploading Screen Recording 2023-03-25 at 4.53.05 PM.mov…

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