Required changes + consistency fixes

src/pages/NotFound.tsx

@@ -0,0 +1,18 @@
+import React from 'react';
+
+import { Card } from '@app/components/generic/Card';
+import { PrimaryTemplate } from '@components/templates/PrimaryTemplate';
+
+export const NotFound = (): JSX.Element => {
+  return (
+    <PrimaryTemplate title="Page not found" tagline="404">
+      <Card
+        title="The requested file or directory could not be found"
+        description="Better luck next time"
+      >
+        <br />
+        <br />
+      </Card>
+    </PrimaryTemplate>
+  );
+};