Move jest configuration

jest.config.js

@@ -1,6 +0,0 @@
-module.exports = {
-  roots: ['src/newsreader/js/tests/'],
-
-  clearMocks: true,
-  coverageDirectory: 'coverage',
-};

package.json

@@ -64,5 +64,12 @@
     "useTabs": false,
     "bracketSpacing": true,
     "arrowParens": "avoid"
+  },
+  "jest": {
+    "roots": [
+      "src/newsreader/js/tests/"
+    ],
+    "clearMocks": true,
+    "coverageDirectory": "coverage"
   }
 }