remove unused files

src/index.css

@@ -1,13 +0,0 @@
-body {
-  margin: 0;
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
-    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
-    sans-serif;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-}
-
-code {
-  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
-    monospace;
-}

src/index.tsx

@@ -1,8 +1,6 @@
 import React from "react"
 import ReactDOM from "react-dom/client"
-import "./index.css"
 import Board from "./components/Board"
-import reportWebVitals from "./reportWebVitals"
 import InstructionMenu from "./components/InstructionMenu"
 
 const root = ReactDOM.createRoot(document.getElementById("root") as HTMLElement)
@@ -13,8 +11,3 @@ root.render(
     <Board />
   </React.StrictMode>
 )
-
-// If you want to start measuring performance in your app, pass a function
-// to log results (for example: reportWebVitals(console.log))
-// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
-reportWebVitals()

src/react-app-env.d.ts

@@ -1 +0,0 @@
-/// <reference types="react-scripts" />

src/reportWebVitals.ts

@@ -1,15 +0,0 @@
-import { ReportHandler } from "web-vitals"
-
-const reportWebVitals = (onPerfEntry?: ReportHandler) => {
-  if (onPerfEntry && onPerfEntry instanceof Function) {
-    import("web-vitals").then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
-      getCLS(onPerfEntry)
-      getFID(onPerfEntry)
-      getFCP(onPerfEntry)
-      getLCP(onPerfEntry)
-      getTTFB(onPerfEntry)
-    })
-  }
-}
-
-export default reportWebVitals

src/setupTests.ts

@@ -1,5 +0,0 @@
-// jest-dom adds custom jest matchers for asserting on DOM nodes.
-// allows you to do things like:
-// expect(element).toHaveTextContent(/react/i)
-// learn more: https://github.com/testing-library/jest-dom
-import "@testing-library/jest-dom"