Update 404.md

Author: mjmaurya

404.md

@@ -7,7 +7,6 @@ You’re either misspelling the URL \
  or requesting a page that's no longer here.
 
 [Back to Home Page](https://mjmaurya.github.io/)
-[button url="https://mjmaurya.github.io/"]
 
 ![](https://assets.codepen.io/1538474/astronaut.svg)
 ![](https://assets.codepen.io/1538474/spaceship.svg)