Remove extra comments for frontend

Author: eomielan

frontend/src/index.js

@@ -11,7 +11,4 @@ root.render(
   </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();

frontend/src/setupTests.js

@@ -1,5 +1,2 @@
 // 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";