chore: Fix type errors.

Author: jaywcjlove

website/App.tsx

@@ -7,7 +7,7 @@ import MacKeyboard from '../';
 import MDStr from '../README.md';
 import './App.css';
 
-export default () => {
+const APP =  () => {
   const [keyCode, setKeyCode] = useState<number[]>([]);
   return (
     <div className="App">
@@ -44,3 +44,5 @@ export default () => {
     </div>
   );
 }
+
+export default APP;

website/react-app-env.d.ts

@@ -1,77 +1,6 @@
-/// <reference types="node" />
-/// <reference types="react" />
-/// <reference types="react-dom" />
-
-declare namespace NodeJS {
-  interface ProcessEnv {
-    readonly NODE_ENV: 'development' | 'production' | 'test';
-    readonly PUBLIC_URL: string;
-  }
-}
-
-declare module '*.bmp' {
-  const src: string;
-  export default src;
-}
-declare module '*.md' {
-  const src: string;
-  export default src;
-}
-
-declare module '*.gif' {
-  const src: string;
-  export default src;
-}
-
-declare module '*.jpg' {
-  const src: string;
-  export default src;
-}
-
-declare module '*.jpeg' {
-  const src: string;
-  export default src;
-}
-
-declare module '*.png' {
-  const src: string;
-  export default src;
-}
-
-declare module '*.webp' {
-    const src: string;
-    export default src;
-}
-
-declare module '*.svg' {
-  import * as React from 'react';
-
-  export const ReactComponent: React.FunctionComponent<React.SVGProps<SVGSVGElement>>;
-
-  const src: string;
-  export default src;
-}
+/// <reference types="react-scripts" />
 
 declare module '*.module.less' {
   const classes: { readonly [key: string]: string };
   export default classes;
 }
-
-declare module '*.less' {
-  const src: string;
-  export default src;
-}
-declare module '*.module.css' {
-  const classes: { readonly [key: string]: string };
-  export default classes;
-}
-
-declare module '*.module.scss' {
-  const classes: { readonly [key: string]: string };
-  export default classes;
-}
-
-declare module '*.module.sass' {
-  const classes: { readonly [key: string]: string };
-  export default classes;
-}