cleanup eslint config for web-app

Signed-off-by: shmck <shawn.j.mckay@gmail.com>

Author: ShMcK

Diff for: .eslintrc.js

@@ -2,6 +2,7 @@ module.exports = {
   parser: '@typescript-eslint/parser', // Specifies the ESLint parser
   plugins: ['prettier'],
   extends: [
+    'react-app',
     'plugin:@typescript-eslint/recommended', // Uses the recommended rules from the @typescript-eslint/eslint-plugin
     'prettier/@typescript-eslint', // Uses eslint-config-prettier to disable ESLint rules from @typescript-eslint/eslint-plugin that would conflict with prettier
     'plugin:prettier/recommended',

Diff for: package.json

@@ -56,6 +56,7 @@
   },
   "devDependencies": {
     "eslint-config-prettier": "^6.11.0",
+    "eslint-config-react-app": "^5.2.1",
     "eslint-plugin-prettier": "^3.1.4",
     "prettier": "2.0.5",
     "vscode": "^1.1.37",

Diff for: web-app/package.json

@@ -59,21 +59,15 @@
     "@types/react": "^16.9.41",
     "@types/react-addons-css-transition-group": "^15.0.5",
     "@types/react-dom": "^16.9.8",
-    "@typescript-eslint/eslint-plugin": "^3.4.0",
-    "@typescript-eslint/parser": "^3.4.0",
     "babel-loader": "8.1.0",
     "babel-plugin-import": "^1.13.0",
     "customize-cra": "^1.0.0",
-    "eslint": "^7.3.1",
-    "eslint-config-prettier": "^6.11.0",
-    "eslint-plugin-prettier": "^3.1.4",
     "mini-css-extract-plugin": "^0.9.0",
     "node-sass": "^4.14.1",
     "prettier": "2.0.5",
     "react-app-rewired": "^2.1.6",
     "react-scripts": "^3.4.1",
     "sass-loader": "^8.0.2",
-    "typescript": "^3.9.5",
-    "typescript-eslint-parser": "^22.0.0"
+    "typescript": "^3.9.5"
   }
 }