organize eslint rules

.eslintrc.js

@@ -30,10 +30,6 @@ module.exports = {
         FunctionExpression: { body: 1, parameters: 2 },
       },
     ],
-    'react/jsx-filename-extension': [
-      'warn',
-      { extensions: ['.jsx']},
-    ],
     // eslint-plugin-import rules
     'import/no-unresolved': [2, { ignore: ['^@'] }], // ignore @alias/..., @commons/..., ...
   },