Drop redundant @hot-loader/react-dom package

Hot reloading is already set up correctly in the webpack configuration, so we don't need this package (which keeps React pinned to older versions due to strict peer-dependency constraints and laggging releases). In a future update, maybe we should use Fast Refresh for hot reloading instead (see https://github.com/pmmmwh/react-refresh-webpack-plugin).

Author: Oblosys

package.json

@@ -55,7 +55,6 @@
     "@babel/preset-env": "^7.13.15",
     "@babel/preset-react": "^7.13.13",
     "@babel/preset-stage-2": "^7.8.3",
-    "@hot-loader/react-dom": "^16.14.0",
     "@testing-library/jest-dom": "^5.11.10",
     "@testing-library/react": "^11.2.6",
     "@testing-library/user-event": "^13.1.5",

webpack.config.js

@@ -12,7 +12,6 @@ module.exports = {
   },
   resolve: {
     alias: {
-      'react-dom': '@hot-loader/react-dom',
       'react-lifecycle-visualizer': path.join(__dirname, 'src'),
     },
     extensions: ['.js', '.jsx']