revert to .eslintrc

Author: michael-yin

docs/react.md

@@ -54,7 +54,7 @@ Create `frontend/src/application/app_react.js`
 
 ```js
 import React, { useState, useEffect } from 'react';
-import { createRoot } from 'react-dom';
+import { createRoot } from 'react-dom/client';
 
 
 const Clock = () => {

docs/run_npm_command_at_root.md

@@ -14,7 +14,7 @@ Below files will be placed at the root directory instead of the `frontend` direc
 ```
 .babelrc
 .browserslistrc
-eslint.config.js
+.eslintrc
 .nvmrc
 .stylelintrc.json
 package-lock.json

webpack_boilerplate/frontend_template/{{cookiecutter.project_slug}}/.eslintrc

@@ -0,0 +1,18 @@
+{
+  "parser": "@babel/eslint-parser",
+  "extends": [
+    "eslint:recommended"
+  ],
+  "env": {
+    "browser": true,
+    "node": true
+  },
+  "parserOptions": {
+    "ecmaVersion": 8,
+    "sourceType": "module",
+    "requireConfigFile": false
+  },
+  "rules": {
+    "semi": 2
+  }
+}