Update frontend dependencies (#498)

* update npm packages

* update tsconfig

* remove babelrc, babel presets as well as stable package

* fix svg namespace tag syntax errors

* fix reference error due to namespace and class component having same name

* replace tslint with eslint

* make eslint happier

* update .nvmrc to 14

* update node version to 14 in gh workflow

* fix eslint warnings due to warnings treated as errors on CI (process.env.CI = true)

* pretty fix

* bump node version in Dockerfile

* use createRoot instead of react-dom render

* update browsers list in package.json

frontend/src/components/Stats/Stats.tsx

@@ -17,18 +17,12 @@
 import * as React from 'react';
 import { Maybe } from '../../common';
 import { State as AppState } from '../../state';
-import { Row } from '../List';
-import { PersistentObject } from '../../persist';
 import { Ranking, Range } from '../../common/types';
 
 import './Stats.css';
 
-export namespace Stats {
-  export type Display = 'list' | 'map' | 'Stats';
-
-  export interface Props {
-    appState: Readonly<AppState>;
-  }
+interface StatsProps {
+  appState: Readonly<AppState>;
 }
 
 function displayPercentage(percent: number): string {
@@ -138,7 +132,7 @@ function formatScore(value: Range): string {
   return (min / 100).toFixed(1) + 'x';
 }
 
-export class Stats extends React.Component<Stats.Props, {}> {
+export class Stats extends React.Component<StatsProps> {
   public render() {
     const { appState } = this.props;