Move inline function to a classic style function in routes

src/routes.tsx

@@ -8,6 +8,10 @@ import CommonPage from "./pages/CommonPage";
 import JsonLD from "./components/JsonLD";
 import "./index.scss";
 
+const renderFrontPage = (props): JSX.Element => {
+  return <CommonPage page={FrontPage} {...props} />;
+};
+
 const Routes = () => (
   <Fragment>
     <Helmet>
@@ -22,7 +26,7 @@ const Routes = () => (
       "url": "https://sik.ayy.fi",
     }} />
     <Switch>
-      <Route exact path="/" render={(props) => <CommonPage page={FrontPage} {...props} />} />
+      <Route exact path="/" render={renderFrontPage} />
       <Route component={NotFoundPage} />
     </Switch>
   </Fragment>