Convert User id to a user input field

[masterpranay1]

Currently the userid is created automatically.
User Id looks good but problem is the link which we share, It damm too long. Like this one, https://link-sharing-app.vercel.app/cf3c1ec2-8e55-4768-b15e-4752fc194258

• We can make this short
  like, http://link-sharing-app.vercel.app/username

[Utkarsh-Pandey-GitHub]

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[masterpranay1]

So, we need the refactor the complete process from user sign up to share link process.

• add the username input field in the sign up
• check the username already exist and notify if error
• create the user and give the userid to the username instead of the generated userid