Moved jest config from package.json to external file

package.json

@@ -102,41 +102,6 @@
     "webpack-manifest-plugin": "1.3.2",
     "whatwg-fetch": "2.0.3"
   },
-  "jest": {
-    "coverageDirectory": "<rootDir>/coverage",
-    "collectCoverageFrom": [
-      "src/**/*.{js,jsx,mjs}"
-    ],
-    "setupFiles": [
-      "<rootDir>/config/polyfills.js",
-      "<rootDir>/config/setupEnzyme.js"
-    ],
-    "testMatch": [
-      "<rootDir>/test/**/*.test.{js,jsx,mjs}"
-    ],
-    "testEnvironment": "node",
-    "testURL": "http://localhost",
-    "transform": {
-      "^.+\\.(js|jsx|mjs)$": "<rootDir>/node_modules/babel-jest",
-      "^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
-      "^(?!.*\\.(js|jsx|mjs|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
-    },
-    "transformIgnorePatterns": [
-      "[/\\\\]node_modules[/\\\\].+\\.(js|jsx|mjs)$"
-    ],
-    "moduleNameMapper": {
-      "^react-native$": "react-native-web"
-    },
-    "moduleFileExtensions": [
-      "web.js",
-      "js",
-      "json",
-      "web.jsx",
-      "jsx",
-      "node",
-      "mjs"
-    ]
-  },
   "babel": {
     "presets": [
       "react-app"