refactor(examples): switch examples from cra to nextjs

examples/nextjs/pages/UseKeyPress/index.tsx

@@ -0,0 +1,12 @@
+import React from 'react';
+import { useKeyPress } from '@react-flow/core';
+
+const UseKeyPressComponent = () => {
+  const metaPressed = useKeyPress(['Meta']);
+
+  console.log({ metaPressed });
+
+  return <div />;
+};
+
+export default UseKeyPressComponent;