added more structure, sass, and page routers

src/pages/PageNotFound.jsx

@@ -0,0 +1,21 @@
+// Page - Not Found
+import { useEffect } from 'react';
+
+const PageNotFound = () => {
+
+    useEffect(()=>{
+        document.title = 'Page Not Found';
+    },[]);
+
+    return (
+        <main>
+            <section>
+                <h2>404</h2>
+                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Fugit porro, dolorem, quod facere enim voluptate provident quo labore vero repellat nemo animi ad exercitationem rem quos, possimus libero deleniti laudantium?</p>
+            </section>
+        </main>
+    );
+
+};
+
+export default PageNotFound;