feat(storybook): defined storybook rules

as a glob to simplify the config for consumers

Author: travi

.eslintrc.yml

@@ -1 +1,3 @@
-extends: '@form8ion'
+extends:
+  - '@form8ion'
+  - ./index.js

index.js

@@ -2,5 +2,12 @@ module.exports = {
   rules: {
     'react/jsx-filename-extension': ['error', {extensions: ['.js']}],
     'react/require-default-props': 'off'
-  }
+  },
+
+  overrides: [{
+    files: '.storybook/*.js',
+    rules: {
+      'import/no-extraneous-dependencies': ['error', {devDependencies: true}]
+    }
+  }]
 };