Fix linting errors

Fixing linting errors reported by eslint

frontend/src/routes/index.tsx

@@ -38,12 +38,6 @@ export default function App() {
           <NotFound />
         </Route>
       </Switch>
-
-      <Link to='test@example.org' mail>Mail link</Link>
-      <Link to='test4' external underline noExternalIcon>Internal link</Link>
-      <Link to='test6' external underline noUnderline>External link</Link>
-      <Link to='test5' external noUnderline>Another internal link</Link>
-
       <Footer />
     </AppWrapper>
   )