Removed an empty page

src/app.jsx

@@ -11,7 +11,6 @@ import "./styles/shared.css";
 //include other pages
 import MarkdownPage from "./pages/markdown_page.jsx";
 import CardList from "./pages/card_list.jsx";
-import Concepts from "./pages/concepts.jsx";
 import NotFound from "./pages/not_found.jsx";
 
 //include panels

src/pages/concepts.jsx

@@ -1,17 +0,0 @@
-import React from "react";
-
-class Concepts extends React.Component {
-	constructor(props) {
-		super(props);
-	}
-
-	render() {
-		return (
-			<div>
-				<p>Concepts</p>
-			</div>
-		);
-	}
-}
-
-export default Concepts;