remove unnecessary files and tweak tsconfig.json to make the site work as well as the tests

Author: teseo

src/App.css

@@ -1,12 +1,5 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
-import './index.css';
 import App from './App';
-import * as serviceWorker from './serviceWorker';
 
 ReactDOM.render(<App />, document.getElementById('root'));
-
-// If you want your app to work offline and load faster, you can change
-// unregister() to register() below. Note this comes with some pitfalls.
-// Learn more about service workers: https://bit.ly/CRA-PWA
-serviceWorker.unregister();

src/App.test.tsx

@@ -18,8 +18,7 @@
     "isolatedModules": true,
     "noEmit": true,
     "jsx": "react",
-    "sourceMap": true,
-    "inlineSourceMap": true
+    "sourceMap": true
   },
   "include": [
     "src"