Cleanup and file reorganization

js/components/Router.js

@@ -0,0 +1,24 @@
+import React from 'react';
+import PageIndex from './PageIndex';
+import PageOverview from './PageOverview';
+import PageHelp from './PageHelp';
+
+export default function Router({ pageName, ...props}) {
+  let Comp;
+  switch (pageName) {
+    case 'index':
+      Comp = PageIndex;
+      break;
+    case 'overview':
+      Comp = PageOverview;
+      break;
+    case 'help':
+      Comp = PageHelp;
+      break;
+    default:
+      Comp = 'div';
+      break;
+  }
+
+  return <Comp {...props} />;
+}