explorer-client: apply linting rules

* also rename index.scss to index.css (leftover from scss removing)

explorer/client/src/app/App.tsx

@@ -2,6 +2,7 @@ import Footer from '../components/footer/Footer';
 import Header from '../components/header/Header';
 import Search from '../components/search/Search';
 import AppRoutes from '../pages/config/AppRoutes';
+
 import styles from './App.module.css';
 
 function App() {

explorer/client/src/components/footer/Footer.tsx

@@ -1,6 +1,7 @@
 import { Link } from 'react-router-dom';
 
 import ExternalLink from '../external-link/ExternalLink';
+
 import styles from './Footer.module.css';
 
 function Footer() {

explorer/client/src/index.tsx

@@ -5,7 +5,7 @@ import { BrowserRouter as Router } from 'react-router-dom';
 import App from './app/App';
 import reportWebVitals from './utils/reportWebVitals';
 
-import './index.scss';
+import './index.css';
 
 ReactDOM.render(
     <React.StrictMode>

explorer/client/src/pages/transaction-result/TransactionResult.tsx

@@ -1,6 +1,7 @@
 import { useParams } from 'react-router-dom';
 
 import mockTransactionData from '../../utils/transaction_mock.json';
+
 import styles from './TransactionResult.module.css';
 
 type DataType = {