remove twitter link [skip ci]

Author: richarvey

errors/404.html

@@ -11,6 +11,5 @@
    <br/>
    <h2>Page not Found</h2>
    <a href="https://github.com/richarvey" title="View my Github profile" style><img src="./github.svg" height="15px"/> Github</a>
-   <a href="https://twitter.com/ric__harvey" title="View my twitter profile"><img src="./twitter.svg" height="15px"/> Twitter</a>	
 </body>
 </html>