Fix Random Idea Button doesn't fetch new idea when in "/random" already

fixes #39 by updating Layout.js to do a http redirect instead of changing location. This causes the retrieveRandomIdea function in random.js to run again and get a different idea.

frontend/components/Layout.js

@@ -159,7 +159,7 @@ const Layout = ({ children }) => {
               <div className="navbar-end">
                 <div className="navbar-item">
                   <div className="buttons">
-                    <Link href="/random" className="button is-default">
+                    <Link className="button is-default" onClick={()=>window.location.replace("/random");}>
                       Random Idea
                     </Link>
                   </div>