Enable lints for React Components (#1515)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1515

The out-of-the-box docusaurus template doesn't enable linting for React components. This enables those, fixes the errors, and does dome cleanup around the area (e.g. autofocus is a lot more sane).

Reviewed By: vincentriemer

Differential Revision: D52156109

fbshipit-source-id: f32fede3ec4f8a42ecb7f9d77caa2a30581f35ee

website-next/.eslintrc.cjs

@@ -0,0 +1,26 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+module.exports = {
+  root: false,
+  extends: [
+    'plugin:react/recommended',
+    'plugin:react/jsx-runtime',
+    'plugin:react-hooks/recommended',
+  ],
+  settings: {
+    react: {
+      version: 'detect',
+    },
+  },
+  rules: {
+    'react/prop-types': 'off',
+    'react/no-unstable-nested-components': 'error',
+  },
+};