Ignore @ signs in the sign-up page.

Hi @aaashir,

Please add this to https://d.buzz first, and then add it to https://blog.d.buzz next.

P.S. This long-form version of Blog.D.Buzz is @PostNZT's masterpiece, but I want him to focus on the other critical things he is working on instead, that's why I assigned this task to you. You will also get a little familiar with this long-form repo, and can also copy the solution you make for D.Buzz, and use the same code for Blog.D.Buzz

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Sometimes I tell people their username is @username since that's how it's formatted on HIVE.

But if people try to login with the @ sign, it does not work.

Please add a feature where all @ signs, used in the username text field of the sign-up form is ignored.